| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | date back [prep] the [num ord] | 72 |
|
| 2 | date back to the [num ord] | 72 |
|
| 3 | date back [prep] the [num ord] | 72 |
|
| 4 | dating back [prep] the [num ord] | 32 |
|
| 5 | dates back [prep] the [num ord] | 29 |
|
| 6 | date back [prep] the [num ord] | 8 |
|
| 7 | date back [prep] the last | 6 |
|
| 8 | date back [prep] the 13th | 6 |
|
| 9 | date back [prep] the 12th | 5 |
|
| 10 | date back [prep] the 14th | 5 |
|
