this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Is this matrix orthogonal?
Find number of days
Create an n-by-n null matrix and fill with ones certain positions
Getting the indices from a vector
Find best placement for ordered dominoes (harder)
Scoring for oriented dominoes
Find perfect placement of non-rotating dominoes (easier)
Make a simplified barcode
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