| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of | 954 |
|
| 2 | a prolonged [noun] of | 60 |
|
| 3 | a prolonged [noun sg] of | 58 |
|
| 4 | a prolonged period [prep] | 32 |
|
| 5 | [art] prolonged period of | 32 |
|
| 6 | a prolonged period [prep] | 32 |
|
| 7 | a prolonged period of | 30 |
|
| 8 | a prolonged period of | 30 |
|
