| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a [adj -er] period [subord] | 8 |
|
| 2 | [verb] [prep] a [adj -er] period than | 8 |
|
| 3 | [verb] for a [adj -er] period [subord] | 6 |
|
| 4 | [verb] for a [adj -er] period [subord] | 6 |
|
