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 !
Remove all the consonants
Right and wrong
Back to basics 21 - Matrix replicating
Back to basics 25 - Valid variable names
Convert a vector into a number
middleAsColumn: Return all but first and last element as a column vector
Create a patchwork matrix
Matrix indexing with two vectors of indices
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