| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] 50 [no cls] | 166 |
|
| 2 | [art] 50 per | 151 |
|
| 3 | [art] 50 per | 151 |
|
| 4 | a 50 [unc] | 128 |
|
| 5 | the 50 [unc] | 42 |
|
| 6 | [art] 50 mg/litre | 8 |
|
| 7 | [art] 50 mg/litre | 8 |
|
