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perkalian := proc (A::matrix, B::matrix) local i, j, k, n; global x, y; n := 4; x := array(1 .. n, 1 .. n); y := array(1 .. n, 1 .. n); for i from 1 to n do for j from 1 to n do
x[i, j] := 0; for k from 1 to n do
y[i, k] := A[i, k]*B[k, j]; x[i, j] := x[i, j]+y[i, k] end do
end do end do end proc