| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] a long [noun] of | 30 |
|
| 2 | [vb pp] a long [noun sg] of | 29 |
|
| 3 | [verb] a long period of | 16 |
|
| 4 | [vb pp] a [adj] period of | 15 |
|
| 5 | [vb pp] a long period [prep] | 9 |
|
| 6 | [vb pp] a long period [prep] | 9 |
|
| 7 | [vb pp] [art] long period of | 6 |
|
| 8 | [vb pp] [art] long period of | 6 |
|
| 9 | [vb pp] a long period of | 5 |
|
| 10 | [vb pp] a long period of | 5 |
|
| 11 | [vb pp] a long period of | 5 |
|
