Typos in Ch. 6

[ayushnoori]

List of typos in Ch. 6:

• Incorrect $x''$ in Equation 6.1 on pg. 78, replace with $x'$.
• Disjoint box on pg. 81.
• Period after "different initializations will produce different results" on pg. 84.
• On pg. 89, "Notice also that we now have many layers of clustering: if we’re only only interested in clusters whose elements are at least $k$ units away from each other, we can ‘cut’ the dendrogram at that height and examine all the clusters that exist below that cut point." The word "only" is repeated. Also, this point is only true if we use the min-linkage criterion, which is not immediately clear since min-linkage criterion is brought up in a later paragraph.