test suite 3 prevented my brute-force :(
Replace NaNs with the number that appears to its left in the row.
Distance walked 1D
So many choices
Create an n-by-n null matrix and fill with ones certain positions
Convert matrix to 3D array of triangular matrices
Find the nearest prime number
Pentago: find winning move
Create an 8-color version of an image
Create a figure and plot data
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