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Counting in Finnish
First N Perfect Squares
Back to basics 8 - Matrix Diagonals
Side of an equilateral triangle
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Which doors are open?
Calculate the Levenshtein distance between two strings
Extract leading non-zero digit
Swap the first and last columns
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