Barry and Chris (not Alex and Chris)
Thanks for the catch. I've updated the explanation.
Is this matrix orthogonal?
middleAsColumn: Return all but first and last element as a column vector
Approximation of Pi
Finding perimeter of a rectangle
Converting binary to decimals
Lights Out 15 - 5x5, broken buttons I
Scrabble Scores - 3
Self-similarity 2 - Every third term
Lights Out 6 - 5x5, 13 moves
Self-similarity 3 - Every other pair of terms
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