diff --git a/README.md b/README.md
index 51cb0fd..8c04a72 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ A combinatorics library for Node/JS, PHP, Python, ActionScript
 
 (php/python implementations in progress)
 
-**version 0.1**
+**version 0.1.0**
 
 ![abacus combinatorial numbers](/abacus.jpg)
 
@@ -211,7 +211,13 @@ see: `test/test.bat`
 
 ###Performance
 
-most algorithms are linear `O(n)` (or log-linear `O(nlgn)`) time algorithms, plus statisticaly unbiased, and the author hopes to remain so
+most algorithms:
+
+* are **linear** `O(n)` (or log-linear `O(nlgn)`) time algorithms
+* are **statisticaly unbiased** (e.g uniform sampling methods)
+* use **efficient sucessor methods** (e.g loopless methods / constant delay methods) to generate objects
+* **avoid big-integer arithmetic and computational overhead** (except if explicit ranking / unranking is needed and objects are large)
+
 
 
 ###Todo
diff --git a/src/js/Abacus.js b/src/js/Abacus.js
index 110f382..c018610 100644
--- a/src/js/Abacus.js
+++ b/src/js/Abacus.js
@@ -22,24 +22,16 @@ else if ( !(name in root) ) /* Browser/WebWorker/.. */
 "use strict";
 
 var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
-    ,slice = Array.prototype.slice, bind = Function.prototype.bind
+    ,slice = Array.prototype.slice
     ,Extend = Object.create
     ,Merge = function(a, b) {
         for (var p in b) if (b[HAS](p)) a[p] = b[p];
         return a;
     }
     ,Class = function(s, c) {
-        if ( 1 === arguments.length )
-        {
-            c = s;
-            s = Object;
-        }
+        if ( 1 === arguments.length ) { c = s; s = Object; }
         var ctor = c[CLASS];
-        if ( c[HAS]('__static__') )
-        {
-            ctor = Merge(ctor, c.__static__);
-            delete c.__static__;
-        }
+        if ( c[HAS]('__static__') ) { ctor = Merge(ctor, c.__static__); delete c.__static__; }
         ctor[PROTO] = Merge(Extend(s[PROTO]), c);
         return ctor;
     }
@@ -58,16 +50,6 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
     ,log2 = Math.log2 || function(x) { return Math.log(x) / Math.LN2; }
     ,int = function int( x ) { return parseInt(x||0,10)||0; }
     ,rint = function rint( m, M ) { return round( (M-m)*rnd( ) + m ); }
-    ,clamp = function clamp( v, m, M ) { return ( v < m ) ? m : ((v > M) ? M : v); }
-    ,numeric_asc = function numeric_asc( a, b ) { return a-b; }
-    ,numeric_desc = function numeric_desc( a, b ) { return b-a; }
-    ,array = function( n ) { return new Array(n); }
-    ,n_array = function n_array( dims ) {
-        var len = dims.shift( ),
-            a = len ? new Array( len ) : [ ], i;
-        if ( dims.length ) for (i=0; i<len; i++) a[ i ] = n_array( dims.slice(0) );
-        return a;
-    }
     ,to_binary_string = function to_binary_string( b ) { return b.toString( 2 );  }
     ,to_fixed_binary_string = function to_fixed_binary_string( l ) {
         return function( b ) {
@@ -78,45 +60,8 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
         };
     }
     ,to_fixed_binary_string_32 = to_fixed_binary_string( 32 )
-    ,range = function range( n, options )  {
-        var a, i;
-        options = options || {};
-        a = new Array( n );
-        if ( options[HAS]('value') )
-        {
-            var v = options.value, is_arr_str = !!v.slice;
-            for (i=0; i<n; i++) {a[ i ] = is_arr_str ? v.slice() : v;}
-        }
-        else
-        {
-            var start = options[HAS]('start') ? parseInt(options.start, 10) : 0,
-                step = options[HAS]('step') ? parseInt(options.step, 10) : 1,
-                istep = 0;
-            for (i=0; i<n; i++) {a[ i ] = istep+start; istep += step;}
-        }
-        return a;
-    }
-    // http://stackoverflow.com/questions/6443176/how-can-i-generate-a-random-number-within-a-range-but-exclude-some
-    ,rint_exclude = function rint_exclude( m, M, exclude, exclude_count ) {
-        exclude_count = exclude_count || exclude.length;
-        var i, r = Abacus.rint( m, M - exclude_count );
-        // requires excluded items to be sorted ascending
-        if ( exclude_count > 0 && r >= exclude[0] )
-        {
-            r++;
-            for (i=1; i<exclude_count; i++)
-            {
-                // requires excluded items to be sorted ascending
-                if ( r < exclude[i] ) break;
-                r++;
-            }
-        }
-        return r;
-    }
     ,add = function add( x, y ) { return x+y; }
     ,mul = function mul( x, y ) { return x*y; }
-    // http://jsperf.com/functional-loop-unrolling/2
-    // http://jsperf.com/functional-loop-unrolling/3
     ,sum = function sum( a ) {
         var i, l=a.length, r=l&15, q=r&1, fv=q?a[0]:0;
         for (i=q; i<r; i+=2)  fv += a[i]+a[i+1];
@@ -129,6 +74,8 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
         for (i=r; i<l; i+=16) fv *= a[i]*a[i+1]*a[i+2]*a[i+3]*a[i+4]*a[i+5]*a[i+6]*a[i+7]*a[i+8]*a[i+9]*a[i+10]*a[i+11]*a[i+12]*a[i+13]*a[i+14]*a[i+15];
         return fv;
     }
+    // http://jsperf.com/functional-loop-unrolling/2
+    // http://jsperf.com/functional-loop-unrolling/3
     ,operate = function operate( x, F, F0, i0, i1, reverse ) {
         var len = x.length;
         if ( arguments.length < 5 ) i1 = len-1;
@@ -459,9 +406,9 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
         return product;
     }
     ,cartesian = function cartesian( /* var args here */ ) { }
-    // http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
-    // https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#Sattolo.27s_algorithm
     ,shuffle = function shuffle( a, cyclic, copied ) {
+        // http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
+        // https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#Sattolo.27s_algorithm
         var N, perm, swap, ac, offset;
         ac = true === copied ? a.slice() : a;
         offset = true === cyclic ? 1 : 0;
@@ -477,8 +424,8 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
         // in-place or copy
         return ac;
     }
-    // http://stackoverflow.com/a/32035986/3591273
     ,pick = function pick( a, k, non_destructive ) {
+        // http://stackoverflow.com/a/32035986/3591273
         var picked, backup, i, selected, value, n = a.length;
         k = min( k, n );
         picked = new Array( k ); 
@@ -521,9 +468,11 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
         }
         return beta;
     }
-    // useful for transformations to/from lex / co-lex (actually rev-co-lex) orders
-    // e.g http://www.tcs.hut.fi/Studies/T-79.5202/2008SPR/kalvotwww.pdf
     ,reverse_complement = function reverse_complement( alpha, N ) {
+        // useful for transformations to/from lex / co-lex (actually rev-co-lex) orders
+        // e.g http://www.tcs.hut.fi/Studies/T-79.5202/2008SPR/kalvotwww.pdf
+        if ( null == alpha ) return null;
+        else if ( !alpha.length ) return [];
         var i, k = alpha.length, beta = new Array(k);
         if ( N.length && N.push ) for (i=0; i<k; i++) beta[k-1-i] = N[i]-1-alpha[i];
         else for (i=0; i<k; i++) beta[k-1-i] = N-1-alpha[i];
@@ -727,12 +676,12 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
             return floor(0.5+exp(logFn));
         }
     }
-    // http://en.wikipedia.org/wiki/Derangement
     ,subfactorial = function subfactorial( n ) {
+        // http://en.wikipedia.org/wiki/Derangement
         return floor(0.5 + factorial( n )/EULER);
     }
-    // http://en.wikipedia.org/wiki/Binomial_coefficient
     ,binomial = function binomial( n, k ) {
+        // http://en.wikipedia.org/wiki/Binomial_coefficient
         if ( k > n-k ) k = n - k; // take advantage of symmetry
         if ( 0 > k || 1 > n ) return 0;
         else if ( 0 === k || 1 === n ) return 1;
@@ -747,10 +696,10 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
             return floor(0.5+Cnk);
         }
     }
-    // recursively compute the partition count using the recursive relation:
-    // http://en.wikipedia.org/wiki/Partition_(number_theory)#Partition_function
-    // http://www.programminglogic.com/integer-partition-algorithm/
     ,partitions = function partitions( n, k, m, tbl ) {
+        // recursively compute the partition count using the recursive relation:
+        // http://en.wikipedia.org/wiki/Partition_(number_theory)#Partition_function
+        // http://www.programminglogic.com/integer-partition-algorithm/
         // compute number of integer partitions of n
         // into exactly k parts having m as max value
         // m + k-1 <= n <= k*m
@@ -776,25 +725,10 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
     ,powNK = function( n, k ) {
         return pow(n, k);
     }
-    // http://en.wikipedia.org/wiki/Fibonacci_number
-    ,fibonacci = function( n ) {
-        if ( 0 > n ) return 0;
-        // use lookup table
-        if ( 32 > n ) return FIB_32[ n ];
-        // compute it directly
-        if ( 64 > n )
-        {
-            var f0 = FIB_32[30], f1 = FIB_32[31], f2;
-            while ( n-- > 31 ) { f2 = f0+f1; f0 = f1; f1 = f2; }
-            return f2;
-        }
-        // compute it approximately
-        return floor(0.5+(pow(PHI, n)-pow(1-PHI, n))/SQRT5);
-    }
-    // https://en.wikipedia.org/wiki/Extended_Euclidean_algorithm
-    // https://en.wikipedia.org/wiki/Integer_relation_algorithm
-    // http://userpages.umbc.edu/~rcampbel/NumbThy/Class/Programming/JavaScript/
     ,xgcd = function( a, b ) {
+        // https://en.wikipedia.org/wiki/Extended_Euclidean_algorithm
+        // https://en.wikipedia.org/wiki/Integer_relation_algorithm
+        // http://userpages.umbc.edu/~rcampbel/NumbThy/Class/Programming/JavaScript/
         var a1=1, b1=0, a2=0, b2=1, aneg=1, bneg=1, tmp, q;
         if (a < 0) { a = -a; aneg = -1; };
         if (b < 0) { b = -b; bneg = -1; };
@@ -810,17 +744,13 @@ var  Abacus, PROTO = 'prototype', CLASS = 'constructor', HAS = 'hasOwnProperty'
     }
     ,LEX = 8, REVLEX = 16, COLEX = 32, REVCOLEX = 64, GRAY = 128, RANDOM = 256, STOCHASTIC = 512
     ,ORDERINGS = LEX | REVLEX | COLEX | REVCOLEX | GRAY | RANDOM | STOCHASTIC
-    ,ORDER = function ORDER( ordering ) {
-        if ( !arguments.length || null == ordering ) return LEX; // default
-        if ( ordering.substr )
-        {
-            ordering = ordering.toUpperCase( );
-            return Abacus.ORDER[HAS](ordering) ? Abacus.ORDER[ordering] : LEX;
-        }
-        if ( !(ORDERINGS & ordering) ) ordering = LEX;
-        return ordering;
+    ,ORDER = function ORDER( o ) {
+        if ( !arguments.length || null == o ) return LEX; // default
+        if ( o.substr ) { o = o.toUpperCase( ); return Abacus.ORDER[HAS](o) ? Abacus.ORDER[o] : LEX; }
+        if ( !(ORDERINGS & o) ) o = LEX;
+        return o;
     }
-    ,List, BitArray, CombinatorialIterator, Permutation, Derangement
+    ,BitArray, CombinatorialIterator, Permutation, Derangement
     ,Combination, CombinationRepeat, Partition, RestrictedPartition
     ,Powerset, Tensor, Tuple
     ,NotImplemented = function( method ) { 
@@ -840,16 +770,23 @@ Abacus = {
 
 ,rnd: rnd
 ,rint: rint
-,rint_exclude: rint_exclude
-,clamp: clamp
 
 ,Factorial: factorial
 ,SubFactorial: subfactorial
 ,Binomial: binomial
 ,Partitions: partitions
-,Fibonacci: fibonacci
-,Bell: NotImplemented( )
-,Catalan: NotImplemented( )
+
+,shuffle: shuffle
+,pick: pick
+
+,operate: operate
+,map: map
+,filter: filter
+,each: each
+,intersection: intersection
+,union: union
+,kronecker: kronecker
+,cartesian: cartesian
 
 };
 
@@ -860,11 +797,15 @@ Abacus.ORDER = {
  LEX: LEX
 ,LEXICOGRAPHIC: LEX
 ,REVLEX: REVLEX
+,ANTILEX: REVLEX
 ,REVERSELEXICOGRAPHIC: REVLEX
+,ANTILEXICOGRAPHIC: REVLEX
 ,COLEX: COLEX
 ,COLEXICOGRAPHIC: COLEX
 ,REVCOLEX: REVCOLEX
+,ANTICOLEX: REVCOLEX
 ,REVERSECOLEXICOGRAPHIC: REVCOLEX
+,ANTICOLEXICOGRAPHIC: REVCOLEX
 //,GRAY: GRAY
 ,RANDOM: RANDOM
 ,RANDOMISED: RANDOM
@@ -872,29 +813,6 @@ Abacus.ORDER = {
 
 };
 
-List = Abacus.List = {
-    
- array: array
-,n_array: n_array
-,range: range
-
-,shuffle: shuffle
-,pick: pick
-
-,sum: sum
-,operate: operate
-,map: map
-,filter: filter
-,each: each
-,intersection: intersection
-,union: union
-,complement: complement
-,kronecker: kronecker
-,cartesian: cartesian
-
-};
-
-
 BitArray = Abacus.BitArray = Class({
     
     constructor: function BitArray(n) {
@@ -1070,8 +988,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
             order = ORDER( order );
             self._order = order; self._index = 0;
             self._item = self.__item = null;
-            self._prev = self._index > 0;
-            self._next = self._index < self._count;
+            self._prev = false; self._next = false;
             tot = self._count; n = self.n;
             
             if ( STOCHASTIC & order )
@@ -1092,7 +1009,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                     throw new Error('No Stochastic Transition Matrix given!');
                 }
             }
-            else if ( RANDOM === order )
+            else if ( RANDOM & order )
             {
                 // lazy init
                 if ( !self._traversed ) self._traversed = new BitArray( tot );
@@ -1100,24 +1017,25 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                 self._traversed.set( r=self.randomIndex( ) );
                 self._item = self.__item = self.item( r, LEX );
             }
-            else if ( REVCOLEX === order )
+            else if ( REVCOLEX & order )
             {
                 self.__item = klass.first( n );
                 self._item = klass.dual( self.__item, n, REVCOLEX );
             }
-            else if ( COLEX === order )
+            else if ( COLEX & order )
             {
                 self.__item = klass.last( n );
                 self._item = klass.dual( self.__item, n, COLEX );
             }
-            else if ( REVLEX === order )
+            else if ( REVLEX & order )
             {
                 self._item = self.__item = klass.last( n );
             }
-            else /*if ( LEX === order )*/
+            else /*if ( LEX & order )*/
             {
                 self._item = self.__item = klass.first( n );
             }
+            self._next = null != self._item;
             return self;
         }
         return self._order;
@@ -1131,7 +1049,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
             if ( 0 > index ) index += tot;
             if ( index >=0 && index < tot )
             {
-                if ( REVCOLEX === order )
+                if ( REVCOLEX & order )
                 {
                     self._index = index;
                     self.__item = 0 === index
@@ -1141,7 +1059,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                     : klass.unrank( index, n, tot ));
                     self._item = klass.dual( self.__item, n, REVCOLEX );
                 }
-                else if ( COLEX === order )
+                else if ( COLEX & order )
                 {
                     self._index = index;
                     self.__item = 0 === index
@@ -1151,7 +1069,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                     : klass.unrank( tot-1-index, n, tot ));
                     self._item = klass.dual( self.__item, n, COLEX );
                 }
-                else if ( REVLEX === order )
+                else if ( REVLEX & order )
                 {
                     self._index = index;
                     self._item = self.__item = 0 === index
@@ -1160,7 +1078,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                     ? klass.first( n )
                     : klass.unrank( tot-1-index, n, tot ));
                 }
-                else if ( LEX === order )
+                else if ( LEX & order )
                 {
                     self._index = index;
                     self._item = self.__item = 0 === index
@@ -1184,7 +1102,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
         if ( 0 > index ) index += tot;
         if ( index >= 0 && index < tot )
         {            
-            if ( RANDOM === order )
+            if ( RANDOM & order )
             {
                 traversed = self._traversed;
                 // get next un-traversed index, reject if needed
@@ -1192,7 +1110,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                 traversed.set( r );
                 return klass.unrank( r, n, tot );
             }
-            else if ( REVCOLEX === order )
+            else if ( REVCOLEX & order )
             {
                 return klass.dual( 0 === index
                 ? klass.first( n )
@@ -1200,7 +1118,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                 ? klass.last( n )
                 : klass.unrank( index, n, tot )), n, REVCOLEX );
             }
-            else if ( COLEX === order )
+            else if ( COLEX & order )
             {
                 return klass.dual( 0 === index
                 ? klass.last( n )
@@ -1208,7 +1126,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                 ? klass.first( n )
                 : klass.unrank( tot-1-index, n, tot )), n, COLEX );
             }
-            else if ( REVLEX === order )
+            else if ( REVLEX & order )
             {
                 return 0 === index
                 ? klass.last( n )
@@ -1216,7 +1134,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
                 ? klass.first( n )
                 : klass.unrank( tot-1-index, n, tot ));
             }
-            else //if ( LEX === order )
+            else //if ( LEX & order )
             {
                 return 0 === index
                 ? klass.first( n )
@@ -1262,49 +1180,56 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
     ,next: function( ) {
         var self = this, order = self._order, traversed, r,
             klass = self[CLASS], current = self._item, n = self.n, tot = self._count;
-        // compute next
+        
         if ( STOCHASTIC & order )
         {
             self._item = self.__item = klass.stochastic( self._stochastic[0], n, self._stochastic[2] );
         }
-        else if ( self._index+1 < tot ) 
+        else if ( RANDOM & order )
         {
-            self._next = true; ++self._index;
-            if ( RANDOM === order )
+            if ( self._index+1 < tot )
             {
+                ++self._index;
                 traversed = self._traversed;
                 // get next un-traversed index, reject if needed
                 while ( traversed.isset( r = self.randomIndex( ) ) ) ;
                 traversed.set( r );
                 self._item = self.__item = self.item( r, LEX );
+                self._next = null != self._item;
+            }
+            else
+            {
+                self._next = false;
+                if ( self._traversed )
+                {
+                    self._traversed.dispose( );
+                    self._traversed = null;
+                }
             }
-            else if ( REVCOLEX === order )
+        }
+        else
+        {
+            // compute next, using successor methods / loopless algorithms, WITHOUT using big integer arithemtic
+            if ( REVCOLEX & order )
             {
                 self.__item = klass.succ( 1, self.__item, n, tot );
                 self._item = klass.dual( self.__item, n, REVCOLEX );
             }
-            else if ( COLEX === order )
+            else if ( COLEX & order )
             {
                 self.__item = klass.succ( -1, self.__item, n, tot );
                 self._item = klass.dual( self.__item, n, COLEX );
             }
-            else if ( REVLEX === order )
+            else if ( REVLEX & order )
             {
                 self._item = self.__item = klass.succ( -1, self.__item, n, tot );
             }
-            else /*if ( LEX === order )*/
+            else /*if ( LEX & order )*/
             {
                 self._item = self.__item = klass.succ( 1, self.__item, n, tot );
             }
-        }
-        else
-        {
-            self._next = false;
-            if ( (RANDOM === order) && self._traversed )
-            {
-                self._traversed.dispose( );
-                self._traversed = null;
-            }
+            self._next = null != self._item;
+            if ( self._next ) ++self._index;
         }
         return current;
     }
@@ -1312,8 +1237,7 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
     ,forward: function( ) {
         var self = this;
         self.order( self._order ).index( self._count-1 );
-        self._prev = self._index >= 0;
-        self._next = false;
+        self._prev = self._index >= 0; self._next = false;
         return self;
     }
     
@@ -1328,33 +1252,28 @@ CombinatorialIterator = Abacus.CombinatorialIterator = Class({
         // random and stochastic order has no prev
         if ( (RANDOM | STOCHASTIC) & order ) return null;
         
-        // compute prev
-        if ( self._index-1 >= 0 ) 
+        // compute prev, using successor methods / loopless algorithms, WITHOUT using big integer arithemtic
+        if ( REVCOLEX & order )
         {
-            self._prev = true; --self._index;
-            if ( REVCOLEX === order )
-            {
-                self.__item = klass.succ( -1, self.__item, n, tot );
-                self._item = klass.dual( self.__item, n, REVCOLEX );
-            }
-            else if ( COLEX === order )
-            {
-                self.__item = klass.succ( 1, self.__item, n, tot );
-                self._item = klass.dual( self.__item, n, COLEX );
-            }
-            else if ( REVLEX === order )
-            {
-                self._item = self.__item = klass.succ( 1, self.__item, n, tot );
-            }
-            else /*if ( LEX === order )*/
-            {
-                self._item = self.__item = klass.succ( -1, self.__item, n, tot );
-            }
+            self.__item = klass.succ( -1, self.__item, n, tot );
+            self._item = klass.dual( self.__item, n, REVCOLEX );
         }
-        else
+        else if ( COLEX & order )
+        {
+            self.__item = klass.succ( 1, self.__item, n, tot );
+            self._item = klass.dual( self.__item, n, COLEX );
+        }
+        else if ( REVLEX & order )
+        {
+            self._item = self.__item = klass.succ( 1, self.__item, n, tot );
+        }
+        else /*if ( LEX & order )*/
         {
-            self._prev = false;
+            self._item = self.__item = klass.succ( -1, self.__item, n, tot );
         }
+        self._prev = null != self._item;
+        if ( self._prev ) --self._index;
+        
         return current;
     }
     
@@ -1948,14 +1867,14 @@ Combination = Abacus.Combination = Class(CombinatorialIterator, {
             return null;
         }
         ,rand: function( n ) {
-            var comb, k, g, i, j, p, q;
+            var comb, k, g, i, j, p, q, n_k;
             // O(n), unbiased, only one call to RPNG, NO big integers
             k = n[1]; n = n[0]; comb = new Array(k);
-            g = Abacus.rnd( ); j = 0; q = 0;
+            g = Abacus.rnd( ); j = 0; q = 0; n_k = n-k;
             for (i=1; i<=k; i++)
             {
                 j++; p = (k-i+1) / (n-j+1);
-                while ((p <= g) && (j < n-k+i))
+                while ((p <= g) && (j < n_k+i))
                 {
                     q = p;
                     j++;
@@ -2026,7 +1945,7 @@ CombinationRepeat = Abacus.CombinationRepeat = Class(CombinatorialIterator, {
     ,__static__: {
          // http://en.wikipedia.org/wiki/Combination#Number_of_combinations_with_repetition
          count: function( n ) {
-             return binomial(n[0]+n[1]-1,n[1]);
+             return binomial( n[0]+n[1]-1, n[1] );
          }
         ,dual: Combination.dual
         ,rank: function( item, n, total ) {
@@ -2141,14 +2060,14 @@ CombinationRepeat = Abacus.CombinationRepeat = Class(CombinatorialIterator, {
             return null;
         }
         ,rand: function( n ) {
-            var comb, k, g, i, j, p, q, N;
+            var comb, k, g, i, j, p, q, N, N_k;
             // O(n+k), unbiased, only one call to RPNG, NO big integers
             k = n[1]; n = n[0]; comb = new Array(k);
-            g = Abacus.rnd( ); j = 0; q = 0; N = n+k-1;
+            g = Abacus.rnd( ); j = 0; q = 0; N = n+k-1; N_k = N-k;
             for(i=1; i<=k; i++)
             {
                 j++; p = (k-i+1) / (N-j+1);
-                while ((p <= g) && (j < N-k+i))
+                while ((p <= g) && (j < N_k+i))
                 {
                     q = p;
                     j++;
@@ -2413,7 +2332,16 @@ Powerset = Abacus.Powerset = Class(CombinatorialIterator, {
             for (i=0; i<n; i++) item[ i ] = n-1-i;
             return item;
         }
-        ,succ: CombinatorialIterator.succ
+        ,succ: function( offset, item, n ) {
+            var klass = this;
+            if ( 1 !== offset && -1 !== offset ) offset = 1;
+            return -1 === offset
+            ? (0===item.length
+            ? null : klass.unrank( klass.rank( item )+offset ))
+            : (n===item.length
+            ? null : klass.unrank( klass.rank( item )+offset ))
+            ;
+        }
         ,rand: CombinatorialIterator.rand
         ,stochastic: CombinatorialIterator.stochastic
     }
@@ -2431,8 +2359,6 @@ Tensor = Abacus.Tensor = Class(CombinatorialIterator, {
         var self = this;
         if ( !(self instanceof Tensor) ) 
         {
-            // http://stackoverflow.com/questions/1606797/use-of-apply-with-new-operator-is-this-possible
-            //return new (bind.apply(Tensor, [null].concat(arguments)));
             self = new Tensor( );
             if ( arguments.length )
             {
diff --git a/src/js/Abacus.min.js b/src/js/Abacus.min.js
index 5c4b4ef..72b9bae 100644
--- a/src/js/Abacus.min.js
+++ b/src/js/Abacus.min.js
@@ -5,5 +5,5 @@
 *   @version: 0.1.0
 *   https://github.com/foo123/Abacus
 **/
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r,n,t,e=arguments,u=e.length,i=u?e[0]:[],o=i.length;for(n=1;u>n;n++)for(t=i.slice(),r=0;o>r;r++)i[r]=t[e[n][r]];return i},permute:function(r,n,t){var e,u,i,o=r.length;for(!0===t?(u=new Array(o),i=r):(u=r,i=r.slice()),e=0;o>e;e++)u[e]=i[n[e]];return u},reassign:function(r,n){var t,e=r.length,u=new Array(e);for(t=0;e>t;t++)u[t]=n[r[t]];return u},shuffle:Y,toCycles:function(r,n,t){n=n||r.length;var e,u,i,o=[],f=!0===t?1:0,a=new Array(n),s=new Array(n);for(e=0;n>e;e++)s[e]=e,a[e]=0;for(i=[u=s.shift()],a[u]=1;s.length;){if(u=r[u],a[u])for(i.length>f&&o.push(i),i=[];s.length&&a[u=s.shift()];);a[u]||(i.push(u),a[u]=1)}return i.length>f&&o.push(i),o},fromCycles:function(r,n){var t,e,u,i,o=new Array(n),f=r.length;for(e=0;n>e;e++)o[e]=e;for(t=0;f>t;t++)if(i=r[t],u=i.length,!(2>u)){for(e=0;u-1>e;e++)o[i[e]]=i[e+1];o[i[u-1]]=i[0]}return o},toSwaps:function(r,n){n=n||r.length;var t,u,i,o=[],f=e.toCycles(r,n,!0);for(t=0,u=f.length;u>t;t++)i=f[t],o=o.concat(Q(i));return o},fromSwaps:function(r,n){var t,e,u,i=r.length,o=new Array(n);for(t=0;n>t;t++)o[t]=t;for(t=0;i>t;t++)e=r[t],u=o[e[0]],o[e[0]]=o[e[1]],o[e[1]]=u;return o},toMatrix:function(r,n,t){var e,u,i=new Array(n);for(t=!0===t,e=0;n>e;e++)for(i[e]=new Array(n),u=0;n>u;u++)i[e][u]=0;for(e=0;n>e;e++)t?i[r[e]][e]=1:i[e][r[e]]=1;return i},fromMatrix:function(r,n,t){var e,u,i=new Array(n);for(t=!0===t,e=0;n>e;e++)for(u=0;n>u;u++)r[e][u]&&(t?i[u]=e:i[e]=u);return i},isConnected:function(r,n){var t,e=-1/0;for(n=n||r.length,t=0;n-1>t;t++)if(r[t]>e&&(e=r[t]),t>=e)return!1;return!0}}}),u=r.Derangement=g(t,{constructor:function On(r){var n=this;return n instanceof On?void t.call(n,r):new On(r)},__static__:{count:sn,dual:e.dual,rank:t.rank,unrank:t.unrank,first:t.first,last:t.last,succ:t.succ,stochastic:t.stochastic,rand:function(n){var t,e,u,i,o=new Array(n),f=new Array(n),a=n,s=an(a),c=C(s+1/L),l=C((s/(a*(a-1))+1)/L);for(t=0;n>t;t++)o[t]=t,f[t]=!1;for(t=n-1,u=n;u>=2;){if(!f[t]){do 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e},succ:function(r,n,t){if(n){var e,u,i,o,f,a=n.slice();if(e=t[1],t=t[0],-1===r){for(u=e-1,i=-1;u>0;){if(a[u]>a[u-1]+1){i=u;break}u--}if(-1===i&&0<a[0]&&(i=0),i>-1){for(f=t,u=e-1;u>i;u--)a[u]=--f;a[i]--}else a=null}else{for(u=e-1,i=-1,o=t-e;u>=0;){if(a[u]<o+u){i=u;break}u--}if(i>-1)for(f=a[i],u=i;e>u;u++)a[u]=++f;else a=null}return a}return null},rand:function(n){var t,e,u,i,o,f,a,s;for(e=n[1],n=n[0],t=new Array(e),u=r.rnd(),o=0,a=0,s=n-e,i=1;e>=i;i++){for(o++,f=(e-i+1)/(n-o+1);u>=f&&s+i>o;)a=f,o++,f=a+(1-a)*((e-i+1)/(n-o+1));t[i-1]=o-1,u=(u-a)/(f-a)}return t},stochastic:t.stochastic,complement:J,choose:function(r,n){var t,e=n.length,u=new Array(e);for(t=0;e>t;t++)u[t]=r[n[t]];return u},pick:z,toMatrix:function(r,n,t){var e,u,i,o;for(u=n[1],n=n[0],e=new Array(n),t=!0===t,i=0;n>i;i++)for(e[i]=new Array(n),o=0;n>o;o++)e[i][o]=0;for(i=0;u>i;i++)t?e[r[i]][i]=1:e[i][r[i]]=1;return e},fromMatrix:function(r,n,t){var e,u,i,o;for(u=n[1],n=n[0],e=new Array(u),t=!0===t,i=0;n>i;i++)for(o=0;n>o;o++)r[i][o]&&(t&&u>o?e[o]=i:!t&&u>i&&(e[i]=o));return e}}}),i.conjugate=i.complement,o=r.CombinationRepeat=g(t,{constructor:function Ln(r,n){var e=this;return e instanceof Ln?void t.call(e,[r,n]):new Ln(r,n)},__static__:{count:function(r){return cn(r[0]+r[1]-1,r[1])},dual:i.dual,rank:function(r,n,t){var e,u,i,o,f,a,s=0;for(o=n[1],n=n[0],f=n+o-1,a=t?t:cn(f,o),e=1;o>=e;e++)u=f-1-r[e-1]-e+1,i=o+1-e,s+=u>=i?cn(u,i):0;return a-1-s},unrank:function(r,n,t){var e,u,i,o,f,a,s,c=this;if(t=t||cn(n[0]+n[1]-1,n[1]),0===r)return c.first(n);if(t===r+1)return c.last(n);i=n[1],n=n[0],o=n+i-1,e=new Array(i),u=t,r=u-1-r,u=(o-i)*u/o,a=o-i+1,f=i,s=o-1;do r>=u?(e[i-f]=o-a-i+1,u>0&&(r-=u,u*=f/s),f--,s--):(u*=(s-f)/s,a--,s--);while(f>0);return e},first:function(r){var n,t=r[1],e=new Array(t);for(n=0;t>n;n++)e[n]=0;return e},last:function(r){var n,t=r[1],e=new Array(t);for(r=r[0]-1,n=0;t>n;n++)e[n]=r;return e},succ:function(r,n,t){if(n){var e,u,i,o,f=n.slice();if(e=t[1],t=t[0],-1===r){for(u=e-1,i=-1;u>0;){if(f[u]>f[u-1]){i=u;break}u--}if(-1===i&&0<f[0]&&(i=0),i>-1){for(o=t-1,u=i+1;e>u;u++)f[u]=o;f[i]--}else f=null}else{for(u=e-1,i=-1;u>=0;){if(f[u]<t-1){i=u;break}u--}if(i>-1)for(o=f[i]+1,u=i;e>u;u++)f[u]=o;else f=null}return f}return null},rand:function(n){var t,e,u,i,o,f,a,s,c;for(e=n[1],n=n[0],t=new Array(e),u=r.rnd(),o=0,a=0,s=n+e-1,c=s-e,i=1;e>=i;i++){for(o++,f=(e-i+1)/(s-o+1);u>=f&&c+i>o;)a=f,o++,f=a+(1-a)*(e-i+1)/(s-o+1);t[i-1]=o-i,u=(u-a)/(f-a)}return t},stochastic:i.stochastic}}),f=r.Partition=g(t,{constructor:function Pn(r){var n=this;return n instanceof Pn?void t.call(n,r):new Pn(r)},__static__:{count:function(r){var n,t,e=r>1?2:1;for(n=2;r>n;n++)for(t=r-n+1;t>=1;t--)e+=ln(r,n,t);return e},dual:function(r,n){var t,e,u=[],i=r.length;for(t=0;i>t;t++)if(e=n-r[t],!(0>=e)){if(n===e)return[n];u.unshift(e)}return u},rank:function(r,n,t,e,u){var i,o,f,a=this,s=r.length,c=n;return t=t||a.count(n),e=e||0,u=u||s,o=e,f=r[o],i=c===f?t-1:1===f?0:s>o+1?1+a.rank(r,n-f,t-a.count(n-f),o+1):0},unrank:function(){},first:function(r){var n,t=new Array(r);for(n=0;r>n;n++)t[n]=1;return t},last:function(r){return[r]},succ:function(r,n,t){if(n){var e,u,i,o,f,a,s=n.slice();if(-1===r)if(s[0]>1){for(u=s.length,e=u-1;e>=0&&1===s[e];)e--;for(i=s[e]-1,s=s.slice(0,e+1),s[e]=i,f=j(s),a=t-f;a>0;)o=a,o>i?(o=i,s.push(o)):s.push(a),a-=o}else s=null;else if(s[0]<t){for(u=s.length,e=u-1,e>0&&e--;e>0&&s[e]===s[e-1];)e--;for(s[e]++,s=s.slice(0,e+1),f=j(s),a=t-f;a>0;)s.push(1),a--}else s=null;return s}return null},rand:function(){},stochastic:t.stochastic,conjugate:function(r){var n,t,e,u=r.length,i=r[0],o=new Array(i);for(n=0;i>n;n++)o[n]=1;for(t=1;u>t;t++)for(n=0,e=r[t];i>n&&e>0;)o[n++]++,e--;return o},pack:function(r){var n,t=[],e=r.length,u=r[0],i=[u,1];for(n=1;e>n;n++)u===r[n]?i[1]++:(t.push(i),u=r[n],i=[u,1]);return t.push(i),t},unpack:function(r){var n,t,e,u,i,o=[],f=r.length;for(n=0;f>n;n++)if(i=r[n],1===i[1])o.push(i[0]);else for(e=i[1],u=i[0],t=0;e>t;t++)o.push(u);return o}}}),f.transpose=f.conjugate,a=r.Powerset=g(t,{constructor:function Sn(r){var n=this;return n instanceof Sn?void t.call(n,r):new Sn(r)},__static__:{count:hn,dual:t.dual,rank:function(r){for(var n=0,t=0,e=r.length;e>t;)n+=1<<r[t++]>>>0;return n},unrank:function(r){for(var n=[],t=0;0!==r;)1&r&&n.unshift(t),2&r&&n.unshift(t+1),4&r&&n.unshift(t+2),8&r&&n.unshift(t+3),16&r&&n.unshift(t+4),32&r&&n.unshift(t+5),64&r&&n.unshift(t+6),128&r&&n.unshift(t+7),t+=8,r>>>=8;return n},first:function(){return[]},last:function(r){var n,t=new Array(r);for(n=0;r>n;n++)t[n]=r-1-n;return t},succ:function(r,n,t){var e=this;return 1!==r&&-1!==r&&(r=1),-1===r?0===n.length?null:e.unrank(e.rank(n)+r):t===n.length?null:e.unrank(e.rank(n)+r)},rand:t.rand,stochastic:t.stochastic}}),s=r.Tensor=g(t,{constructor:function Xn(){var r=this;return r instanceof Xn?void(arguments.length?t.call(r,v.call(arguments)):(r.n=[],r._count=0)):(r=new Xn,arguments.length?t.call(r,v.call(arguments)):(r.n=[],r._count=0),r)},__static__:{count:function(r){return r&&r.length?T(r):0},dual:t.dual,rank:function(r,n){var t,e,u=n,i=u.length;if(!i)return-1;for(t=0,e=0;i>e;e++)t=t*u[e]+r[e];return t},unrank:function(r,n){var t,e,u,i,o,f=n,a=f.length;if(!a)return[];for(o=new Array(a),t=r,u=a-1;u>=0;u--)e=f[u],i=t%e,t=~~(t/e),o[u]=i;return o},first:function(r){var n,t=r.length,e=new Array(t);for(n=0;t>n;n++)e[n]=0;return e},last:function(r){var n,t=r,e=t.length,u=new Array(e);for(n=0;e>n;n++)u[n]=t[n]-1;return u},succ:function(r,n,t){if(n){var e,u,i=n.slice(),o=t,f=o.length;if(-1===r){for(e=f-1;e>=0&&i[e]-1<0;)e--;if(e>=0)for(i[e]--,u=e+1;f>u;u++)i[u]=o[u]-1;else i=null}else{for(e=f-1;e>=0&&i[e]+1===o[e];)e--;if(e>=0)for(i[e]++,u=e+1;f>u;u++)i[u]=0;else i=null}return i}return null},rand:function(n){var t,e=n,u=e.length,i=new Array(u);for(t=0;u>t;t++)i[t]=r.rint(0,e[t]-1);return i},stochastic:t.stochastic,product:U,component:function(r,n){var t,e,u,i,o,f,a=[],s=n,c=s.length;for(t=0;c>t;t++)if(u=s[t],o=r[t],i=u[o],i instanceof Array)for(e=0,f=i.length;f>e;e++)a.push(i[e]);else a.push(i);return a}}}),c=r.Tuple=g(t,{constructor:function Nn(r,n){var e=this;return e instanceof Nn?void t.call(e,[r||1,n||2]):new Nn(r,n)},__static__:{count:function(r){return _n(r[1],r[0])},dual:function(r,n){return K(r,n[1])},rank:function(r,n){var t,e,u=n[0];for(n=n[1],t=0,e=0;u>e;e++)t=t*n+r[e];return t},unrank:function(r,n){var t,e,u,i,o,f=n[0];for(n=n[1],o=new Array(f),t=r,u=f-1;u>=0;u--)e=n,i=t%e,t=~~(t/e),o[u]=i;return o},first:function(r){var n,t=r[0],e=new Array(t);for(n=0;t>n;n++)e[n]=0;return e},last:function(r){var n,t=r[0],e=new Array(t);for(r=r[1]-1,n=0;t>n;n++)e[n]=r;return e},succ:function(r,n,t){if(n){var e,u,i=n.slice(),o=t[0],t=t[1];if(-1===r){for(e=o-1;e>=0&&i[e]-1<0;)e--;if(e>=0)for(i[e]--,u=e+1;o>u;u++)i[u]=t-1;else i=null}else{for(e=o-1;e>=0&&i[e]+1===t;)e--;if(e>=0)for(i[e]++,u=e+1;o>u;u++)i[u]=0;else i=null}return i}return null},rand:function(n){var t,e=n[0],u=new Array(e);for(n=n[1]-1,t=0;e>t;t++)u[t]=r.rint(0,n);return u},stochastic:s.stochastic}}),r.Magic=en,r.Magic.product=on,r.Magic.pythagorean=un,r.Magic.test=fn,r.Latin=tn,r});
\ No newline at end of file
diff --git a/test/combinations.txt b/test/combinations.txt
index 0382f68..0663004 100644
--- a/test/combinations.txt
+++ b/test/combinations.txt
@@ -116,28 +116,28 @@ o.order("revcolex")
 [ 0, 1, 3 ]
 [ 0, 1, 2 ]
 o.random()
-[ 1, 3, 5 ]
+[ 1, 2, 3 ]
 o.order("random")
-[ 0, 1, 3 ]
-[ 1, 4, 5 ]
-[ 1, 3, 5 ]
-[ 0, 3, 5 ]
-[ 1, 2, 5 ]
 [ 0, 4, 5 ]
-[ 0, 2, 3 ]
+[ 1, 2, 4 ]
+[ 0, 3, 4 ]
+[ 1, 4, 5 ]
 [ 1, 2, 3 ]
+[ 1, 3, 5 ]
 [ 0, 2, 4 ]
-[ 1, 2, 4 ]
-[ 3, 4, 5 ]
 [ 2, 3, 4 ]
-[ 0, 2, 5 ]
+[ 1, 3, 4 ]
 [ 0, 1, 5 ]
+[ 1, 2, 5 ]
+[ 0, 1, 4 ]
+[ 0, 1, 3 ]
 [ 2, 4, 5 ]
-[ 2, 3, 5 ]
+[ 3, 4, 5 ]
+[ 0, 3, 5 ]
+[ 0, 2, 5 ]
 [ 0, 1, 2 ]
-[ 0, 1, 4 ]
-[ 0, 3, 4 ]
-[ 1, 3, 4 ]
+[ 2, 3, 5 ]
+[ 0, 2, 3 ]
 o.order("colex").range(-5, -1)
 [ [ 2, 3, 5 ], [ 0, 4, 5 ], [ 1, 4, 5 ], [ 2, 4, 5 ], [ 3, 4, 5 ] ]
 o.dispose()
diff --git a/test/combinations_repeats.txt b/test/combinations_repeats.txt
index 6adab3d..3ddc05e 100644
--- a/test/combinations_repeats.txt
+++ b/test/combinations_repeats.txt
@@ -298,62 +298,62 @@ o.order("revcolex")
 o.random()
 [ 0, 1, 2 ]
 o.order("random")
+[ 3, 4, 5 ]
+[ 2, 3, 4 ]
+[ 2, 5, 5 ]
+[ 1, 3, 3 ]
+[ 0, 3, 5 ]
+[ 4, 4, 5 ]
+[ 0, 1, 3 ]
 [ 3, 3, 5 ]
+[ 0, 5, 5 ]
+[ 1, 2, 4 ]
+[ 1, 3, 4 ]
+[ 0, 4, 5 ]
 [ 0, 2, 4 ]
-[ 0, 1, 3 ]
-[ 0, 0, 2 ]
+[ 3, 5, 5 ]
+[ 3, 4, 4 ]
+[ 4, 5, 5 ]
 [ 0, 3, 4 ]
-[ 0, 4, 5 ]
+[ 0, 0, 5 ]
+[ 0, 1, 5 ]
+[ 1, 2, 3 ]
+[ 1, 1, 4 ]
+[ 1, 1, 2 ]
+[ 1, 4, 4 ]
 [ 0, 2, 5 ]
+[ 2, 4, 4 ]
 [ 1, 1, 5 ]
-[ 0, 0, 4 ]
-[ 0, 1, 2 ]
 [ 1, 4, 5 ]
-[ 0, 5, 5 ]
-[ 0, 2, 3 ]
-[ 1, 2, 5 ]
-[ 0, 1, 4 ]
-[ 3, 5, 5 ]
-[ 1, 1, 2 ]
-[ 1, 3, 5 ]
-[ 3, 3, 3 ]
-[ 2, 2, 3 ]
-[ 2, 4, 5 ]
-[ 2, 3, 4 ]
-[ 2, 2, 5 ]
+[ 1, 5, 5 ]
+[ 0, 3, 3 ]
+[ 0, 1, 2 ]
 [ 2, 3, 3 ]
-[ 1, 2, 2 ]
-[ 1, 1, 3 ]
-[ 0, 0, 0 ]
-[ 0, 2, 2 ]
-[ 1, 2, 4 ]
-[ 3, 4, 4 ]
-[ 3, 3, 4 ]
 [ 5, 5, 5 ]
-[ 1, 1, 1 ]
-[ 0, 0, 3 ]
+[ 0, 0, 4 ]
 [ 0, 0, 1 ]
-[ 1, 3, 4 ]
-[ 2, 3, 5 ]
-[ 4, 4, 4 ]
-[ 2, 4, 4 ]
+[ 3, 3, 3 ]
 [ 0, 1, 1 ]
-[ 3, 4, 5 ]
-[ 2, 5, 5 ]
-[ 0, 1, 5 ]
-[ 1, 1, 4 ]
-[ 0, 3, 5 ]
-[ 2, 2, 4 ]
+[ 1, 2, 2 ]
+[ 0, 2, 2 ]
 [ 0, 4, 4 ]
-[ 0, 0, 5 ]
-[ 1, 3, 3 ]
-[ 1, 4, 4 ]
-[ 1, 5, 5 ]
+[ 1, 2, 5 ]
+[ 2, 2, 4 ]
 [ 2, 2, 2 ]
-[ 0, 3, 3 ]
-[ 4, 5, 5 ]
-[ 4, 4, 5 ]
-[ 1, 2, 3 ]
+[ 1, 1, 3 ]
+[ 4, 4, 4 ]
+[ 2, 4, 5 ]
+[ 0, 0, 2 ]
+[ 1, 1, 1 ]
+[ 0, 1, 4 ]
+[ 2, 2, 5 ]
+[ 0, 0, 3 ]
+[ 2, 3, 5 ]
+[ 2, 2, 3 ]
+[ 3, 3, 4 ]
+[ 0, 2, 3 ]
+[ 1, 3, 5 ]
+[ 0, 0, 0 ]
 o.order("colex").range(-5, -1)
 [ [ 1, 5, 5 ], [ 2, 5, 5 ], [ 3, 5, 5 ], [ 4, 5, 5 ], [ 5, 5, 5 ] ]
 o.dispose()
diff --git a/test/permutations.txt b/test/permutations.txt
index 1926626..03c5940 100644
--- a/test/permutations.txt
+++ b/test/permutations.txt
@@ -136,32 +136,32 @@ o.order("revcolex")
 [ 2, 3, 1, 0 ]
 [ 3, 2, 1, 0 ]
 o.random()
-[ 0, 1, 3, 2 ]
+[ 0, 2, 3, 1 ]
 o.order("random")
 [ 3, 0, 2, 1 ]
+[ 2, 0, 1, 3 ]
+[ 0, 2, 1, 3 ]
+[ 1, 3, 2, 0 ]
+[ 0, 1, 3, 2 ]
+[ 2, 1, 3, 0 ]
+[ 2, 3, 1, 0 ]
 [ 1, 0, 3, 2 ]
-[ 3, 1, 0, 2 ]
-[ 3, 0, 1, 2 ]
-[ 0, 3, 2, 1 ]
 [ 1, 0, 2, 3 ]
+[ 3, 0, 1, 2 ]
+[ 1, 2, 0, 3 ]
+[ 1, 3, 0, 2 ]
+[ 3, 2, 0, 1 ]
 [ 0, 2, 3, 1 ]
-[ 1, 3, 2, 0 ]
-[ 1, 2, 3, 0 ]
-[ 0, 1, 2, 3 ]
-[ 0, 1, 3, 2 ]
+[ 3, 1, 0, 2 ]
 [ 2, 3, 0, 1 ]
-[ 0, 2, 1, 3 ]
-[ 3, 2, 1, 0 ]
-[ 3, 2, 0, 1 ]
+[ 2, 1, 0, 3 ]
 [ 3, 1, 2, 0 ]
-[ 2, 0, 1, 3 ]
-[ 1, 2, 0, 3 ]
+[ 3, 2, 1, 0 ]
+[ 1, 2, 3, 0 ]
 [ 2, 0, 3, 1 ]
-[ 2, 3, 1, 0 ]
-[ 2, 1, 3, 0 ]
+[ 0, 3, 2, 1 ]
+[ 0, 1, 2, 3 ]
 [ 0, 3, 1, 2 ]
-[ 2, 1, 0, 3 ]
-[ 1, 3, 0, 2 ]
 o.order("colex").range(-5, -1)
 [ [ 1, 2, 0, 3 ],
   [ 2, 0, 1, 3 ],
@@ -169,14 +169,14 @@ o.order("colex").range(-5, -1)
   [ 1, 0, 2, 3 ],
   [ 0, 1, 2, 3 ] ]
 o.order("stochastic",[ [ 0, 1, 0, 0 ], [ 1/3, 0, 1/3, 1/3 ], [ 1/3, 0, 1/3, 1/3 ], [ 1/3, 0, 1/3, 1/3 ] ]).range(0, 9)
-[ [ 1, 2, 3, 0 ],
-  [ 1, 3, 0, 2 ],
+[ [ 1, 3, 0, 2 ],
+  [ 1, 0, 3, 2 ],
   [ 1, 3, 0, 2 ],
-  [ 1, 3, 2, 0 ],
   [ 1, 0, 3, 2 ],
-  [ 1, 3, 2, 0 ],
+  [ 1, 3, 0, 2 ],
   [ 1, 0, 3, 2 ],
   [ 1, 3, 0, 2 ],
-  [ 1, 2, 3, 0 ],
-  [ 1, 0, 2, 3 ] ]
+  [ 1, 0, 3, 2 ],
+  [ 1, 0, 3, 2 ],
+  [ 1, 2, 0, 3 ] ]
 o.dispose()
diff --git a/test/powersets.txt b/test/powersets.txt
index 38860b1..fee6897 100644
--- a/test/powersets.txt
+++ b/test/powersets.txt
@@ -96,24 +96,24 @@ o.order("revcolex")
 [ 2, 1, 0 ]
 [ 3, 2, 1, 0 ]
 o.random()
-[ 2, 1, 0 ]
+[ 3, 1, 0 ]
 o.order("random")
+[ 2, 1 ]
 [ 2, 0 ]
-[ 3 ]
-[ 3, 1 ]
-[ 3, 2, 1, 0 ]
+[ 3, 0 ]
+[ 3, 2, 1 ]
+[ 3, 1, 0 ]
+[ 1, 0 ]
 [ 2, 1, 0 ]
 [ 0 ]
+[ 2 ]
+[ 3, 2, 1, 0 ]
+[ 3, 1 ]
 [ 3, 2 ]
-[ 1 ]
-[ 3, 0 ]
-[ 2, 1 ]
-[ 3, 2, 1 ]
 [ 3, 2, 0 ]
-[ 2 ]
-[ 1, 0 ]
+[ 1 ]
+[ 3 ]
 []
-[ 3, 1, 0 ]
 o.order("colex").range(-5, -1)
 [ [ 1 ], [ 3, 2 ], [ 2 ], [ 3 ], [] ]
 o.dispose()
diff --git a/test/tensors.txt b/test/tensors.txt
index f577051..b3d3030 100644
--- a/test/tensors.txt
+++ b/test/tensors.txt
@@ -46,13 +46,13 @@ o.order("revcolex")
 [ 1, 0, 0 ]
 [ 0, 0, 0 ]
 o.random()
-[ 0, 0, 1 ]
-o.order("random")
 [ 0, 1, 1 ]
+o.order("random")
+[ 0, 0, 0 ]
 [ 0, 0, 1 ]
 [ 0, 0, 2 ]
+[ 0, 1, 1 ]
 [ 0, 1, 0 ]
-[ 0, 0, 0 ]
 [ 0, 1, 2 ]
 o.order("colex").range(-5, -1)
 [ [ 1, 0, 0 ], [ 2, 0, 0 ], [ 0, 1, 0 ], [ 1, 1, 0 ], [ 2, 1, 0 ] ]
diff --git a/test/tuples.txt b/test/tuples.txt
index a7df801..095a71d 100644
--- a/test/tuples.txt
+++ b/test/tuples.txt
@@ -153,33 +153,33 @@ o.order("revcolex")
 o.random()
 [ 1, 1, 1 ]
 o.order("random")
-[ 1, 2, 1 ]
-[ 2, 2, 0 ]
-[ 1, 2, 0 ]
-[ 1, 1, 2 ]
-[ 0, 2, 0 ]
-[ 2, 1, 1 ]
-[ 2, 0, 2 ]
 [ 2, 1, 0 ]
-[ 1, 1, 1 ]
-[ 0, 0, 0 ]
-[ 0, 1, 2 ]
-[ 1, 2, 2 ]
-[ 0, 1, 1 ]
-[ 0, 2, 2 ]
-[ 2, 0, 0 ]
-[ 1, 0, 0 ]
-[ 2, 0, 1 ]
-[ 0, 1, 0 ]
 [ 2, 1, 2 ]
-[ 2, 2, 2 ]
-[ 0, 2, 1 ]
 [ 0, 0, 2 ]
+[ 1, 0, 0 ]
+[ 0, 1, 1 ]
+[ 1, 0, 2 ]
+[ 0, 1, 2 ]
+[ 0, 2, 1 ]
+[ 1, 1, 1 ]
+[ 2, 0, 0 ]
 [ 1, 1, 0 ]
+[ 1, 2, 0 ]
+[ 1, 2, 1 ]
+[ 2, 1, 1 ]
 [ 1, 0, 1 ]
-[ 1, 0, 2 ]
-[ 0, 0, 1 ]
 [ 2, 2, 1 ]
+[ 0, 0, 0 ]
+[ 0, 2, 0 ]
+[ 2, 0, 2 ]
+[ 2, 0, 1 ]
+[ 1, 1, 2 ]
+[ 0, 1, 0 ]
+[ 2, 2, 0 ]
+[ 0, 0, 1 ]
+[ 1, 2, 2 ]
+[ 0, 2, 2 ]
+[ 2, 2, 2 ]
 o.order("colex").range(-5, -1)
 [ [ 1, 1, 2 ], [ 2, 1, 2 ], [ 0, 2, 2 ], [ 1, 2, 2 ], [ 2, 2, 2 ] ]
 o.dispose()