| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun sg] period | 338 |
|
| 2 | [prep] a [num] [noun sg] period | 206 |
|
| 3 | [prep] a ten [noun sg] [noun] | 39 |
|
| 4 | [prep] a ten [noun sg] [noun sg] | 39 |
|
| 5 | [prep] [art] ten [noun sg] period | 13 |
|
| 6 | [prep] a ten [noun sg] period | 8 |
|
| 7 | [prep] a ten [noun sg] period | 8 |
|
| 8 | [prep] a ten [noun] period | 8 |
|
| 9 | [prep] a ten [noun sg] period | 8 |
|
