←
O → A → B → D → T
3 + 2 + 2 + 1 = 8 ✓
O → A → C → D → T
3 + 2 + 3 + 1 = 9
O → B → D → T
6 + 2 + 1 = 9
O → A → C → T
3 + 2 + 5 = 10
O → A → D → T
3 + 7 + 1 = 11