| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [noun] ' national [noun] | 10 |
|
| 2 | [noun] [prep] [noun] ' national [noun sg] | 9 |
|
| 3 | [noun] [prep] [noun] ' national insurance | 8 |
|
| 4 | [noun] [prep] [noun] ' national insurance | 8 |
|
