| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] hours at [art] time | 20 |
|
| 2 | [num] hours at [art] time | 20 |
|
| 3 | [num] hours at a time | 19 |
|
| 4 | [num] hours at a time | 19 |
|
