Compute the sum of diagonal elements of a square matrix and store the larger sum to s.
Eg : a = [1 2 3; 2 3 4; 4 5 10]
sum of diagonal 1 = 1+3+10=14
sum of diagonal 2 = 3+3+4=10
Return elements unique to either input
Given a 4x4 matrix, swap the two middle columns
Dimensions of a rectangle
Basic commands - Least common multiple
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