| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] period when [noun] [noun sg] | 8 |
|
| 2 | [art] period when [noun] [noun sg] | 8 |
|
| 3 | a period when [noun] [noun sg] | 6 |
|
| 4 | a period when [noun] [noun sg] | 6 |
|
| 5 | period when [art] [noun] [noun sg] | 6 |
|
| 6 | period when [art] [noun] [noun sg] | 6 |
|
| 7 | period when [noun] [noun sg] [be] | 5 |
|
| 8 | period when [noun] [noun sg] be | 5 |
|
