| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adj] period of | 156 |
|
| 2 | [adv] [adj] period of | 132 |
|
| 3 | [adv] lengthy [noun] of | 15 |
|
| 4 | [adv] lengthy [noun sg] of | 13 |
|
| 5 | [adv] lengthy period of | 5 |
|
| 6 | [adv] lengthy period of | 5 |
|
| 7 | [adv] lengthy period of | 5 |
|
| 8 | [adv] lengthy period [prep] | 5 |
|
| 9 | [adv] lengthy period [prep] | 5 |
|
