find the row echelon form of 0 1 3 1 1 0 1 1 3 1 0 2 1 1 2 0 a − −       =    in matlab

main.m
A = [0, 1, 3, 1; 1, 0, 1, 1; 3, 1, 0, 2; 1, 1, 2, 0];
rref(A)
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