Inspired by Problem 1827 by Andrew Newell.
Write a function that has the following property:
The test suite is simple. The goal is just to obtain a general method.
Most nonzero elements in row
Function composition - harder
Matrix multiplication across rows
Decrypt the cypher using XOR encryption (for beginners)
Permute diagonal and antidiagonal
Getting the indices from a matrice
BLOCK x3 (Version 4)
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