| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period of [adj] years [pron] | 11 |
|
| 2 | period [prep] [adj] years [pron] | 11 |
|
| 3 | period [prep] [adj] years [pers pn] | 10 |
|
| 4 | period [prep] [num] years [pron] | 10 |
|
| 5 | period [prep] [adj] years it | 5 |
|
| 6 | period [prep] [adj] years it | 5 |
|
