| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been designed to be | 16 |
|
| 2 | have [been] designed to be | 16 |
|
| 3 | [vb -s] [been] designed to be | 11 |
|
| 4 | has [been] designed to be | 11 |
|
