| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun] period [prep] | 62 |
|
| 2 | [prep] a [adj] [noun] period [prep] | 62 |
|
| 3 | over a [adj] [noun] [noun] [prep] | 54 |
|
| 4 | over a [adj] [noun] [noun sg] [prep] | 53 |
|
| 5 | over [art] [adj] [noun] period [prep] | 32 |
|
| 6 | over [art] [adj] [noun] period [prep] | 32 |
|
| 7 | over a [adj] [noun] period [prep] | 23 |
|
| 8 | over a [adj] [noun] period [prep] | 23 |
|
| 9 | over a [adj] [noun] period [prep] | 23 |
|
