| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [adv prt] a [adj] period | 15 |
|
| 2 | [vb -s] over a [adj] period | 15 |
|
| 3 | [vb -s] [adv prt] a long period | 7 |
|
