| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] [prep] a long [noun] | 100 |
|
| 2 | a [noun] [prep] a long [noun sg] | 98 |
|
| 3 | a [noun] [prep] a [adj] period | 46 |
|
| 4 | a [noun] [prep] a [adj] period | 41 |
|
| 5 | [art] [noun] [prep] a long period | 27 |
|
| 6 | a [noun] [prep] a long period | 6 |
|
| 7 | a [noun] [prep] a long period | 5 |
|
| 8 | a [noun] [prep] a long period | 5 |
|
| 9 | a [noun] [prep] [art] long period | 5 |
|
