| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [prep] a long period | 44 |
|
| 2 | [prep] [noun pl] [prep] a [adj] period | 36 |
|
| 3 | [prep] [noun pl] [prep] a long [noun] | 25 |
|
| 4 | [prep] [noun pl] [prep] a long [noun sg] | 25 |
|
| 5 | [prep] [noun pl] [prep] [art] long period | 9 |
|
| 6 | [prep] [noun pl] [prep] [art] long period | 9 |
|
| 7 | [prep] [noun pl] [prep] a long period | 9 |
|
| 8 | [prep] [noun pl] [prep] a long period | 9 |
|
| 9 | [prep] [noun pl] [prep] a long period | 9 |
|
