Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Make a Palindrome Number
Back to basics 15 - Benchmark
Column norms of a matrix
Maximum value in a matrix
Repeat string n times - 3
Recaman Sequence - I
Lunar Arithmetic (Multiplication)
Make visible max values
nth term of an infinite series
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