| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] time | 268 |
|
| 2 | [prep] a [adj] period [prep] time | 268 |
|
| 3 | over a [adj] period [prep] [noun] | 134 |
|
| 4 | over a [adj] period [prep] [noun sg] | 122 |
|
| 5 | over a [adj] period [prep] time | 120 |
|
| 6 | over a [adj] [noun sg] [prep] time | 118 |
|
| 7 | over a [adj] [noun] [prep] time | 118 |
|
| 8 | over [art] [adj] period [prep] time | 117 |
|
| 9 | over [art] [adj] period [prep] time | 117 |
|
| 10 | over a [adj] period [prep] time | 116 |
|
| 11 | over a [adj] period [prep] time | 113 |
|
| 12 | over a [adj] period [prep] time | 113 |
|
| 13 | over a [adj] period [prep] time | 113 |
|
