| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [noun] [prep] a [adj] period | 17 |
|
| 2 | and [noun] [prep] a [adj] period | 13 |
|
| 3 | and [noun] [prep] a [adj] period | 13 |
|
| 4 | [conj] [noun pl] [prep] a [adj] period | 10 |
|
| 5 | [conj] [noun] over a [adj] period | 9 |
|
| 6 | [conj] [noun sg] [prep] a [adj] period | 9 |
|
