Pity that eval is forbidden - I had quite an elegant solution using it.
Determine Whether an array is empty
Replicate elements in vectors
Find nearest prime number less than input number
Given area find sides
Create an n-by-n null matrix and fill with ones certain positions
Create incremental spiral WITHOUT USING EVAL or FEVAL
Insert certain elements into a vector.
Number of problems
Wayfinding 5 - Travel contour
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