| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [conj] [prep] | 19 |
|
| 2 | [prep] a [adj] period [conj] [prep] | 19 |
|
| 3 | over a [adj] [noun] [conj] [prep] | 10 |
|
| 4 | over [art] [adj] period [conj] [prep] | 9 |
|
| 5 | over [art] [adj] period [conj] [prep] | 9 |
|
| 6 | over a [adj] period [conj] [prep] | 7 |
|
| 7 | over a [adj] period [conj] [prep] | 6 |
|
