Back and Forth Rows
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 1, Multiples of 3 and 5
Is this triangle right-angled?
Divisible by 9
Word Distance - Average Sort
Lights Out 10 - 5x5, with wrapping, 6 moves
Divisible by n, prime vs. composite divisors
Scrabble Scores - 4
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