4 ′ → 3 ′
4 ′ → 8 ′
4 ′ → 5 ′
4 ′ → 7 ′
3 ′ → 2 ′
8 ′ → 9 ′
5 ′ → 6 ′
7 ′ → 6 ′
T + 4 C + 4 R 2 → 2 C + 4 R 2
T + 4 C + 4 R 2 → C + 2 R 2
2 C + 4 R 2 → 2 R 2
C + 2 R 2 → 2 R 2