Convert the input to a cell array, but only if necessary.
If the input is a string, return a 1-by-1 cell array containing the string. If the input is a cell array of strings, return the input unaltered.
Remove all the consonants
Extract leading non-zero digit
Check if sorted
Twins in a Window
Minimum of each diagonal
Calculate the Hamming distance between two strings
Connect Four: find winning move
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