Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Inner product of two vectors
High school cafeteria
Angle between two vectors
Create an index-powered vector
Count decimal digits of a number
Recaman Sequence - II
Find the biggest digit in a matrix
Calculate trends in time series
Find two triangular numbers whose sum is input.
Bridge and Torch Problem - Length of Unique Time List
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