| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] [noun] of | 108291 |
|
| 2 | a [adj] period of | 842 |
|
| 3 | a [adj] [noun] period | 437 |
|
| 4 | [adj] [noun] period of | 64 |
|
| 5 | a [noun] period of | 53 |
|
