3+3+3+3 = \( 3 \cdot 4 \) = 12
2+2+2+2+2 = \( 2 \cdot 5 \) = 10
6+6+6 = \( 6 \cdot 3 \) = 18
9+9 = \( 9 \cdot 2 \) = 18