| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | as a [noun] | 57052 |
|
| 2 | [prep] a period | 2137 |
|
| 3 | [prep] a period | 2137 |
|
| 4 | as [art] period | 54 |
|
| 5 | as [art] period | 54 |
|
| 6 | as a period | 41 |
|
| 7 | as a period | 41 |
|
