| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] year [noun] | 324 |
|
| 2 | [prep] a [adj] [noun] period | 324 |
|
| 3 | [prep] a [adj] [noun sg] period | 318 |
|
| 4 | [prep] [art] [adj] year period | 173 |
|
| 5 | [prep] [art] [adj] year period | 173 |
|
| 6 | [prep] a [adj] year period | 111 |
|
| 7 | [prep] a [adj] year period | 110 |
|
