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by dragontamer 2384 days ago
Rock: 4-letters (Mod4 == 0)

Paper: 5-letters (Mod4 == 1)

Spock: 5-letters (Mod4 == 1)

Lizard: 6-letters (Mod 4 == 2)

Scissors: 8-letters (Mod 4 == 0)

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There are no 3-letter or 7-letter words (aka: Blah % 4 != 3 given the inputs). So they just left the 3rd index (4th word) empty.