| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv prt] a long period of | 6 |
|
| 2 | [adv prt] a long period of [noun] | 8 |
|
| 3 | [adv prt] a long period of time | 8 |
|
| 4 | [adv prt] a long period of time | 8 |
|
| 5 | [adv prt] a long period of [noun sg] | 8 |
|
