| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [art] key to [pos pn] | 15 |
|
| 2 | is the key to [pron] | 15 |
|
| 3 | is [art] key to their | 5 |
|
| 4 | is [art] key to their | 5 |
|
