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+ The original Panex puzzle is from the Japanese Magic Company
+from the 1980's. Mathematicians at Bell Laboratories estimated
+the number of moves to swap 2 columns of order 10 to be
+27,564 <= N <= 31,537. It came in two varieties: one with a
+blue and a yellow pyramid of order 10 on silver tiles; in the
+gold version pieces of each color look alike i.e. no pyramid
+is drawn on them), this is a little harder.
+ The original Tower of Hanoi puzzle is the invention of
+Edouard Lucas and was sold as a toy in France in 1883. The
+legend of 64 disks in the great temple of Benares of the god
+Brahma is also his invention.
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