| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long [noun] [conj] | 366 |
|
| 2 | [prep] a long [noun sg] [conj] | 365 |
|
| 3 | [prep] a [adj] period [conj] | 138 |
|
| 4 | [prep] a long period [conj] | 28 |
|
| 5 | [prep] [art] long period [conj] | 28 |
|
