length!! and not "not isempty"... good point!
Tic Tac Toe FTW
Increment a number, given its digits
Back to basics 1 - Saving
Compare two input matrices
Magic is simple (for beginners)
Pandigital number n°2 (Inspired by Project Euler 32)
BLOCK x3 (Version 3)
Chess ELO rating system
Mysterious digits operation (easy)
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