| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | were [verb] at [adj] intervals | 16 |
|
| 2 | were [vb pp] at [adj] intervals | 16 |
|
| 3 | were [verb] at regular intervals | 6 |
|
| 4 | were [verb] at regular intervals | 6 |
|
