Matrix (3x3 only) rotation:
3 inputs: x matrix, n times and m option.
output: y matrix with n x 45 degree rotation. m=1 for clockwise & m=2 for counterclockwise.
I think it would be better to allow negative n instead of adding a third parameter.
Angle between two vectors
Find best placement for ordered dominoes (harder)
Reindex a vector
Generate a string like abbcccddddeeeee
Do Fast Fourier Transformation
Rotate Matrix Clockwise (45 Degree)
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