8 + 7 ---------- |
7 + 3 ---------- |
8 + 7 ---------- |
7 + 1 ---------- |
5 + 7 ---------- |
7 + 6 ---------- |
6 + 7 ---------- |
7 + 1 ---------- |
4 + 7 ---------- |
7 + 1 ---------- |
4 + 7 ---------- |
7 + 9 ---------- |
7 + 7 ---------- |
7 + 3 ---------- |
2 + 7 ---------- |
7 + 2 ---------- |