| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] period of [adj] years [pers pn] | 10 |
|
| 2 | [art] period [prep] [adj] years [pers pn] | 10 |
|
| 3 | a period [prep] [adj] years [pers pn] | 10 |
|
| 4 | [art] period [prep] [adj] years [pers pn] | 10 |
|
| 5 | [art] period of [adj] years [pers pn] | 10 |
|
| 6 | [art] period [prep] [num] years [pers pn] | 9 |
|
| 7 | [art] period [prep] [adj] years it | 5 |
|
