Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
04 - Scalar Equations 2
07 - Common functions and indexing 6
Matrix of almost all zeros, except for main diagonal
Repeat string n times - 2
Delete the rows in the middle
Van Eck's Sequence's nth member
String permutations on phone keyboard
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