This is a problem where there's probably a good built-in function, but I don't know it.
this will be hard to beat !
Read a Soroban Abacus
Bottles of beer
Angle between Two Vectors
Max index of 3D array
middleAsColumn: Return all but first and last element as a column vector
Matrix indexing with two vectors of indices
Create a patchwork matrix
Set a diagonal
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