| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] [prep] a while | 14 |
|
| 2 | [indef pn] for a while | 13 |
|
| 3 | [indef pn] for a while | 13 |
|
| 4 | nothing [prep] a while | 7 |
|
