| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] a [noun] of | 29986 |
|
| 2 | [be] a [noun sg] of | 29366 |
|
| 3 | [be] [art] period of | 180 |
|
| 4 | [be] [art] period of | 180 |
|
| 5 | [be] a period [prep] | 179 |
|
| 6 | [be] a period [prep] | 179 |
|
| 7 | [be] a period of | 156 |
|
| 8 | [be] a period of | 156 |
|
| 9 | [be] a period of | 156 |
|
