Finding Perfect Squares
Return a list sorted by number of occurrences
Find the sum of the elements in the "second" diagonal
How long is the longest prime diagonal?
0, 2, 0, -2, 0, 2, 0, -2, ...
Lunar Arithmetic (Multiplication)
Your favourite city!
Cryptography with A Square Matrix : Decoding
Simple return on investment
Calculate trends in time series
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