doublePuzzle (a,b,c,d)
Given 4 strings, computes the number of pairs of puzzles glued together to form a rhombus with boundaries a,b,c,d in clockwise order.
In WebApp mode, the output is interactive and allows to test associativity of puzzles.
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At the moment, the interactive part only works on nonequivariant puzzles.
The object doublePuzzle is a function closure.