| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj -er] [num] years [prep] | 23 |
|
| 2 | [prep] a further [adj] years [prep] | 23 |
|
| 3 | for a [adj -er] [adj] years [prep] | 18 |
|
| 4 | [prep] a [adj -er] two years [prep] | 6 |
|
| 5 | [prep] a [adj -er] two years [prep] | 6 |
|
| 6 | [prep] a [adj -er] [adj] years after | 5 |
|
