▲
                     │
   UP → 406 (PB 460(C), Δ +54)   ↓   DOWN → 229 (PB 292(C), Δ +63)
   DOWN → 406 (PB 460(C), Δ +54) ↑   UP → 690 (PB 609(C), Δ -81)
                     │
        ┌────────────┼────────────┐
        │             │            │
        ▼             ▼            ▼
068 (UP→583/907, DOWN→340, PB 086(C), Δ +18)
690 (UP→796/472, DOWN→406, PB 609(C), Δ -81)
340 (UP→229, DOWN→583/907, PB 304(C), Δ -36)
        │             │            │
        ▼             ▼            ▼
583 (PB 538(C), Δ -45)   796 (PB 769(C), Δ -27)   907 (PB 970(C), Δ +63)