Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
All your base are belong to us
04 - Scalar Equations 3
Count decimal digits of a number
nth term of an infinite series
Bridge and Torch Problem - Length of Unique Time List
'5*3' copy character 3 - five times
String permutations on phone keyboard
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