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time × 106mathematics × 35
logical-deduction × 19
calculation-puzzle × 17
lateral-thinking × 9
knowledge × 8
optimization × 7
story × 6
real × 6
visual × 5
geometry × 4
probability × 4
seasonal × 4
situation × 3
outer-space × 3
riddle × 2
wordplay × 2
enigmatic-puzzle × 2
cipher × 2
pattern × 2
no-computers × 2
circuitry × 2
number-sequence × 1
combinatorics × 1
rebus × 1