| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period of [adj] | 224 |
|
| 2 | over a period of [det] | 32 |
|
| 3 | [prep] a period of several | 22 |
|
| 4 | [prep] a period of several | 22 |
|
| 5 | over a [noun] of several | 17 |
|
| 6 | over a [noun sg] of several | 17 |
|
| 7 | over a period of several | 16 |
|
| 8 | over a period of several | 16 |
|
| 9 | over [art] period of several | 16 |
|
| 10 | over a period [prep] several | 16 |
|
| 11 | over a period of several | 16 |
|
| 12 | over a period of several | 16 |
|
| 13 | over a period [prep] several | 16 |
|
| 14 | over [art] period of several | 16 |
|
| 15 | over a period of several | 16 |
|
