Sum the same indexed (unique) rows. Examine the test suite.
Related Challenge - Problem 2172. Delete the rows in the middle
Is my wife right? Now with even more wrong husband
Find the sum of the elements in the "second" diagonal
Number of Circles in a Number
Back to basics 15 - classes
Matrix to column conversion
Your favourite city!
Decrypt a secret message!
Homemade: Control Charts
Cryptography with A Square Matrix : Encoding
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