Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Back to basics 9 - Indexed References
Getting the indices from a matrice
MATCH THE STRINGS (2 CHAR) very easy
Create incrementing array
Upper triangular matrix
Recaman Sequence - I
String permutations on phone keyboard
Write c^3 as sum of two squares a^2+b^2
Delete the rows in the middle
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