Create a reverse checkbox matrix with '69'.
Where the size is the input and output will be a square checkbox matrix.
If input is 4 then output will be
[ 0 69 0 69
69 0 69 0
0 69 0 69
69 0 69 0]
Back to basics 1 - Saving
Flip the main diagonal of a matrix
The Answer to Life, the Universe, and Everything
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Put Two 1D matrices into one 1D matrix
Make combination of two given matrices.
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