| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period | 137 |
|
| 2 | [noun] [prep] [adj] a long | 35 |
|
| 3 | [prep] [adj] a long period | 10 |
|
| 4 | [noun] [prep] [adj] a period | 8 |
|
