Square a number
I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Flip the main diagonal of a matrix
Make a run-length companion vector
Create a Multiplication table matrix...
Replace multiples of 5 with NaN
Who invented zero?
Bring up website
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