| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which had [verb] for | 56 |
|
| 2 | which had [vb pp] for | 55 |
|
| 3 | which had existed [prep] | 30 |
|
| 4 | which had existed [prep] | 30 |
|
| 5 | which have existed for | 16 |
|
| 6 | which [verb] existed for | 16 |
|
| 7 | which [vb past] existed for | 7 |
|
| 8 | which had existed for | 7 |
|
| 9 | which had exist for | 7 |
|
| 10 | [pron] had existed for | 7 |
|
