| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have existed [prep] [adj] | 14 |
|
| 2 | which have existed [prep] [num] | 9 |
|
| 3 | which had existed [prep] [adj] | 7 |
|
| 4 | which has existed [prep] [adj] | 5 |
|
| 5 | which have existed for [adj] | 5 |
|
| 6 | which have existed for [adj] | 5 |
|
