| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj -er] [noun] than | 555 |
|
| 2 | [prep] a [adj -er] period [conj] | 25 |
|
| 3 | [prep] a [adj] period than | 18 |
|
| 4 | [prep] a [adj -er] period than | 18 |
|
| 5 | [prep] a [adj -er] period than | 18 |
|
| 6 | [prep] a [adj -er] period [subord] | 18 |
|
| 7 | [prep] [art] [adj -er] period than | 18 |
|
| 8 | [prep] [art] [adj -er] period than | 18 |
|
