shuffle_square (349B)
1 # Shuffle square 2 3 A [word] which can be written as the [shuffle] of a word with itself 4 5 [np_complete] to test if a word is a shuffle square 6 7 It's [open_problem] what is the minimum alphabet size required to have infinitely many words without shuffle squares, cf https://a3nm.net/work/research/questions/#words-without-shuffle-squares 8 9 Up: [shuffle]