unrestricted
| random sample
| unrestricted | |
| econ. commun. | korlátozatlan |
| random sample | |
| math. | véletlen minta |
| |||
| korlátozatlan | |||
|
unrestricted : 4 phrases in 3 subjects |
| Agriculture | 2 |
| Mathematics | 1 |
| Patents | 1 |