| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv prt] a [adj] period [prep] | 19 |
|
| 2 | [verb] [adv prt] a [adj] period of | 16 |
|
| 3 | [verb] over a [adj] period [prep] | 15 |
|
| 4 | [verb] [adv prt] a long period [prep] | 7 |
|
| 5 | [verb] [adv prt] a long period [prep] | 7 |
|
| 6 | [vb past] [adv prt] a [adj] period [prep] | 5 |
|
