| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [num] year [noun] | 507 |
|
| 2 | a [num] year [noun sg] | 500 |
|
| 3 | a [num] [noun] period | 236 |
|
| 4 | a [num] [noun sg] period | 233 |
|
| 5 | [art] [num] year period | 196 |
|
| 6 | [art] [num] year period | 196 |
|
| 7 | a [num] year period | 130 |
|
| 8 | a [adj] year period | 130 |
|
| 9 | a [num] year period | 128 |
|
| 10 | a [num] year period | 128 |
|
