| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a period [prep] [noun] | 48 |
|
| 2 | [adv] a period of [noun] | 47 |
|
| 3 | [adv] a period of [noun] | 47 |
|
| 4 | [adv] a period [prep] [noun sg] | 37 |
|
| 5 | [adv prt] a period [prep] [noun] | 27 |
|
| 6 | over a period [prep] [noun] | 25 |
|
| 7 | over a period [prep] [noun] | 25 |
|
| 8 | [adv] a period [prep] time | 21 |
|
| 9 | [adv] a period [prep] time | 21 |
|
| 10 | [adv] a period [prep] [noun] | 17 |
|
| 11 | [adv] a period [prep] [noun pl] | 10 |
|
