Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Back and Forth Rows
Scoring for oriented dominoes
Number of Horns on a unicorn!
Equal to their cube
Lunar Arithmetic (Multiplication)
Lunar Arithmetic (Addition)
Homemade: Control Charts
longest sequence of nans
Bridge and Torch Problem - Probability
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