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
Make a checkerboard matrix
Remove any row in which a NaN appears
Replace NaNs with the number that appears to its left in the row.
07 - Common functions and indexing 2
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