| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] time | 357 |
|
| 2 | a [adj] period [prep] time | 339 |
|
| 3 | a long period [prep] [noun] | 160 |
|
| 4 | a long period [prep] time | 115 |
|
| 5 | a long [noun] [prep] time | 109 |
|
| 6 | [art] long period [prep] time | 105 |
|
| 7 | a long period [prep] time | 102 |
|
