| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] [adv] [conj] | 12 |
|
| 2 | [prep] a period [prep] [adv] [conj] | 12 |
|
| 3 | over a period [prep] [adv] [conj] | 9 |
|
| 4 | over a period [prep] [adv] [conj] | 9 |
|
| 5 | a period [prep] [adv] [adv] [conj] | 22 |
|
| 6 | a period [prep] not [adv] [conj] | 21 |
|
| 7 | a period [prep] [not/n't] [adv] [conj] | 21 |
|
| 8 | a period [prep] not [adv] [conj] | 21 |
|
| 9 | a period [prep] [adv] [adv] [conj] | 22 |
|
| 10 | a period [prep] [adv] [adv] [conj] | 22 |
|
| 11 | a period [prep] [adv] less [conj] | 14 |
|
| 12 | a period [prep] [adv] less [conj] | 14 |
|
| 13 | a period [prep] [adv] longer [conj] | 6 |
|
| 14 | a period [prep] [adv] longer [conj] | 6 |
|
| 15 | a period [prep] [adv] [conj] [adj] | 16 |
|
| 16 | a period [prep] [adv] [conj] [num] | 16 |
|
