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( arr[0][0] + arr[0][1] ) ( arr[1][0] + arr[1][1] )

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C[0] = arr[0][0] arr[1][0]
C[1] = arr[0][0] arr[1][1]
C[2] = arr[0][1] arr[1][0]
C[3] = arr[0][1] arr[1][1]