Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Sum of diagonal of a square matrix
Check if number exists in vector
03 - Matrix Variables 5
03 - Matrix Variables 6
Is this triangle right-angled?
'5*3' copy character 3 - five times
longest sequence of nans
Cryptography with A Square Matrix : Decoding
Write out numbers in words
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