| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a period of [adj] years [pers pn] | 10 |
|
| 2 | [art] period of [adj] years [pers pn] | 10 |
|
| 3 | a period of [adj] years [pers pn] | 10 |
|
| 4 | [art] period of [adj] years [pers pn] | 10 |
|
| 5 | period of [adj] years [pers pn] [verb] | 9 |
|
| 6 | period of [adj] years [pers pn] [vb past] | 6 |
|
