| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | long period of [adj] | 51 |
|
| 2 | long period [prep] [adj] | 49 |
|
| 3 | long period [prep] [adj] | 49 |
|
| 4 | long period [prep] [num] | 6 |
|
| 5 | longer period [prep] [adj] | 6 |
|
