| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] year period | 111 |
|
| 2 | [prep] a [num] year period | 111 |
|
| 3 | [prep] a ten year [noun] | 15 |
|
| 4 | [prep] a ten year [noun sg] | 15 |
|
| 5 | [prep] [art] ten year period | 13 |
|
| 6 | [prep] a ten year period | 8 |
|
| 7 | [prep] a ten [noun sg] period | 8 |
|
| 8 | [prep] a ten year period | 8 |
|
| 9 | [prep] a ten [noun] period | 8 |
|
| 10 | [prep] a ten year period | 8 |
|
| 11 | [prep] a ten year period | 8 |
|
