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