| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] [num] | 74 |
|
| 2 | [prep] a [adj] period [prep] [num] | 74 |
|
| 3 | over [art] [adj] period [prep] [num] | 25 |
|
| 4 | over [art] [adj] period [prep] [num] | 25 |
|
| 5 | over a [adj] [noun] [prep] [num] | 24 |
|
| 6 | over a [adj] [noun sg] [prep] [num] | 23 |
|
| 7 | over a [adj] period [prep] [adj] | 12 |
|
| 8 | over a [adj] period [prep] [num] | 11 |
|
| 9 | over a [adj] period [prep] [num] | 10 |
|
| 10 | over a [adj] period [prep] [num] | 10 |
|
