Not really my solution... just a slightly cheating version of @bmtran's.
Increment a number, given its digits
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Getting the absolute index from a matrix
Is the input divisible by 3?
Back to basics 12 - Input Arguments
Back to basics 9 - Indexed References
Back to basics 20 - singleton dimensions
Back to basics 22 - Rotate a matrix
Back to basics 21 - Matrix replicating
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