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Shortest solution (so far) that keeps to the spirit of the challenge. Code is also easy to read.
Another short solution that keeps to the spirit of the challenge.
Determine if input is odd
Sum of diagonal of a square matrix
middleAsColumn: Return all but first and last element as a column vector
What number has this problem?
Beginner's Problem - Squaring
Divisible by 10
Radiation Heat Transfer — View Factors (3)
Lights Out 4 - 5x5, 8 moves
Divisible by 16
Approximation of Pi (vector inputs)
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