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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
Find the sum of the elements in the "second" diagonal
Count up then down
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
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