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