6 6 × 6 6 × = = 2 3 3 4 4 × × 2 2 × 4 × × = 2 2 × 8 4 8 × 4 2 3 2 × 3 8 × 4 = 4 4−3 = 4 2 × 3 2 6 2 12 12 × × 6 3 2 3 × × 2 2 12 × × 6 = 4 2−1 6−2 = 4 4 3 × × 2