| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which dates [adv prt] to the [num ord] | 8 |
|
| 2 | which dates [adv prt] to the [num ord] | 8 |
|
| 3 | which dates back [prep] the [num ord] | 8 |
|
| 4 | which dates [adv prt] [prep] the [num ord] | 8 |
|
