
!24Toroid          E.T.Emms
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     This is similar to !24Tiles (q.v) with the exception that the
rule concerning the border is different. Here we have to find a
solution such that the top edge matches the bottom edge (they do
not have to be equicoloured), and the lefthand edge and the
righthand edge match. If you imagine the top edge of a solution
folded back and downwards it can be attached to the bottom edge to
form (conceptually) a tube. This tube can be bent so that its
lefthand and righthand edges may be joined. We now have all 24
tiles obeying the 'where they touch they match' arranged on a
toroid (a doughnut). Hence the name of the program. I consider
this to be more difficult than the !24Tiles puzzle. 

!24ToroidA
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    This has the computer solving the 24Toroid puzzle.


