| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [adj] period of | 252 |
|
| 2 | [noun] [prep] a [adj] period of | 239 |
|
| 3 | [noun] [prep] a prolonged [noun] of | 15 |
|
| 4 | [noun] [prep] a prolonged [noun sg] of | 15 |
|
| 5 | [noun] [prep] a prolonged period [prep] | 12 |
|
| 6 | [noun] [prep] a prolonged period [prep] | 12 |
|
| 7 | [noun] [prep] [art] prolonged period of | 10 |
|
| 8 | [noun] [prep] a prolonged period of | 10 |
|
| 9 | [noun] [prep] a prolonged period of | 10 |
|
| 10 | [noun] [prep] a prolonged period of | 10 |
|
