| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | crop up [prep] time to time | 7 |
|
| 2 | crop up from time to [noun sg] | 7 |
|
| 3 | crop up [prep] time to [noun sg] | 7 |
|
| 4 | crop up from time to [noun sg] | 7 |
|
