| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | mark the 40th anniversary | 13 |
|
| 2 | mark the 40th [noun sg] | 13 |
|
| 3 | mark the 40th anniversary | 13 |
|
| 4 | to mark the 40th [noun] | 7 |
|
