| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | apart [prep] a [adj] period of | 5 |
|
| 2 | apart [prep] a continuous period of | 5 |
|
| 3 | apart for a [adj] period of | 5 |
|
| 4 | apart [prep] a [adj] period of | 5 |
|
| 5 | apart [prep] a continuous period of | 5 |
|
