Find the sum of the elements in the "second" diagonal
middleAsColumn: Return all but first and last element as a column vector
Vector of numbers divisible by 3
Extract leading non-zero digit (★★★★★)
*Prime number check 2 (in construction)
Mo money, mo math 1! (★★★)
Remove the row average (★★★)
Reindex a vector (★★)
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