You need multiple tests to check a variety of situations.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
improve test suite
Back to basics 22 - Rotate a matrix
Back to basics 25 - Valid variable names
Return elements unique to either input
Given a 4x4 matrix, swap the two middle columns
Basic arrays operations.
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