| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [num] year period | 66 |
|
| 2 | [noun sg] [prep] a [num] year period | 34 |
|
| 3 | [noun pl] [prep] a [num] year period | 24 |
|
| 4 | [vb pp] [prep] a [num] year period | 14 |
|
| 5 | [verb] [prep] a [num] year period | 14 |
|
| 6 | [adj] [prep] a [num] year period | 6 |
|
| 7 | [noun prp] [prep] a [num] year period | 5 |
|
| 8 | [prep] a [adj] [num] year period | 5 |
|
| 9 | [prep] a [num] year period [prep] | 16 |
|
| 10 | [prep] a [num] year period [prep] | 16 |
|
