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paper-folding × 24geometry × 13
mathematics × 5
three-dimensional × 4
optimization × 2
puzzle-creation × 2
dissection × 2
logical-deduction × 1
enigmatic-puzzle × 1
cipher × 1
lateral-thinking × 1
no-computers × 1
open-ended × 1
mystery × 1
word-problem × 1
mazes × 1
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symbols × 1
