| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period of | 16 |
|
| 2 | [adv] a long period of | 12 |
|
| 3 | over a long period [prep] | 9 |
|
| 4 | over a long period [prep] | 9 |
|
| 5 | over a long period of | 8 |
|
| 6 | over [art] long period of | 8 |
|
| 7 | over [art] long period of | 8 |
|
| 8 | over a long [noun sg] of | 8 |
|
| 9 | over a long period of | 8 |
|
| 10 | [adv prt] a long period of | 8 |
|
| 11 | over a long [noun] of | 8 |
|
| 12 | over a long period of | 8 |
|
| 13 | over a long period of | 8 |
|
