Please add a simple example to the Problem Statement to illustrate the method you describe in words. Please also add further tests to the Test Suite (cf. Problem 44521). Currently it is easily 'hacked', as demonstrated with Solution 1465530.
Back to basics 8 - Matrix Diagonals
Set some matrix elements to zero
Create a Multiplication table matrix...
Convert yards to feet
Remove the first, third and fifth rows of a matrix
Find the mean of a 2-D matrix after excluding elements of specified sub-matrix
Cannibal eating odd and even numbered men
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