Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Find perfect placement of non-rotating dominoes (easier)
Is it an Armstrong number?
Is it a number?
Find a Pythagorean triple
Change the first and last diagonal element of the identity matrix to zero
Divide elements by sum of elements
Integer to boolean
Fill the matrix - 1
Repeat string n times
Hexagonal numbers on a spiral matrix
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