| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [adv] [been] [prep] existence for | 9 |
|
| 2 | [verb] [adv] [been] [prep] existence for | 9 |
|
| 3 | [vb -s] [adv] [been] [prep] existence for | 6 |
|
| 4 | has [adv] [been] [prep] existence for | 6 |
|
