Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Return the largest number that is adjacent to a zero
Back to basics 20 - singleton dimensions
Getting the absolute index from a matrix
Rotate a Matrix by 90 degrees
Find the biggest digit in a matrix
Decrypt a secret message!
Recaman Sequence - I
Recaman Sequence - III
replace nan values iteratively.
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