Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Return the 3n+1 sequence for n
Find state names that end with the letter A
Is my wife right?
Matrix with different incremental runs
Basic arrays operations.
Bridge and Torch Problem - Minimum time
String permutations on phone keyboard
Digit concentration in Champernowne's constant
Fill the matrix - 1
Write out numbers in words
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