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.
Remove all the words that end with "ain"
Test for balanced parentheses
subtract central cross
Fix the last element of a cell array
Narcissistic number ?
BLOCK x3 (Version 4)
Find indices of diagonal elements
BLOCK x3 (Version 3)
Decrypt the cypher using XOR encryption (for beginners)
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