| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] and [noun pl] [v-ing] back | 9 |
|
| 2 | [noun pl] and [noun pl] [vb past] back | 8 |
|
| 3 | [noun pl] and [noun pl] date back | 5 |
|
| 4 | [noun pl] and [noun pl] dating back | 5 |
|
