---+-----+-----
 1 | 1   |{73}
---+-----+-----
 2 |{74} | 94
---+-----+-----
 3 | 95  | 113
---+-----+-----
 4 |{114}| 121
---+-----+-----
 5 | 122 | 135
---+-----+-----
 6 | 136 | 156
---+-----+-----
 7 |{157}|{165}
---+-----+-----