Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Make a checkerboard matrix
Return elements unique to either input
Count up then down
Create an 'arrow-head" matrix
Celsius to Kelvin
Integer to boolean
Bridge and Torch Problem - Minimum time
Decrypt a secret message!
Homemade: Control Charts
Write out numbers in words
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