| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] of | 94714 |
|
| 2 | [prep] a [noun sg] of | 89895 |
|
| 3 | [prep] [art] period of | 2328 |
|
| 4 | [prep] a period [prep] | 1754 |
|
| 5 | [prep] a period [prep] | 1754 |
|
| 6 | [prep] a period of | 1600 |
|
| 7 | [prep] a period of | 1600 |
|
