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Fixed the problem with the double-probe hack by checking if the start
state is "default" (i.e., identity perms and zero orientations). This suffices for now. Eventually we want to consider making this support more general start states (either by inverting and conjugating by the start state before the second probe, or by normalizing the start state when we read the puzdef and pre/post-multiplying by the start state on every input/output operation). We can also consider reducing the pruning table by inversions which would give a 2X improvement in memory efficiency but we'd have to change the double-probe to an inversion reduction (so one lookup instead of two) which likely would be faster anyway.
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