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
Right and wrong
Find out missing number from a vector of 9 elements
String permutations on phone keyboard
Van Eck's Sequence's nth member
Determine if input is a valid AHP evaluation matrix
Bridge and Torch Problem - Probability
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