I think the question should be a matrix of x*x
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Select every other element of a vector
Replace NaNs with the number that appears to its left in the row.
Back to basics 21 - Matrix replicating
Basics: 'Find the eigenvalues of given matrix
Concatenate two strings
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