| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period of | 544 |
|
| 2 | [prep] a [adj] period of | 544 |
|
| 3 | over a [adj] [noun] of | 361 |
|
| 4 | over a [adj] [noun sg] of | 356 |
|
| 5 | over a [adj] period [prep] | 176 |
|
| 6 | over [art] [adj] period of | 160 |
|
| 7 | over [art] [adj] period of | 160 |
|
| 8 | over a [adj] period of | 143 |
|
| 9 | over a [adj] period of | 137 |
|
| 10 | over a [adj] period of | 137 |
|
