| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv prt] [prep] a long [noun] | 178 |
|
| 2 | [adv prt] [prep] a [adj] period | 47 |
|
| 3 | [adv] [prep] a long period | 36 |
|
| 4 | [adv prt] [prep] [art] long period | 12 |
|
