| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun pl] ['s] national | 15 |
|
| 2 | [prep] [noun pl] ' national | 13 |
|
| 3 | [prep] employers ['s] national | 6 |
|
| 4 | [prep] employees ['s] national | 5 |
|
| 5 | on [noun pl] ['s] national | 5 |
|
| 6 | on [noun pl] ['s] national | 5 |
|
