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selective system : 33 phrases in 15 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Aviation | 5 |
| Chemistry | 1 |
| Commerce | 1 |
| Communications | 1 |
| Drilling | 1 |
| Electronics | 5 |
| Finances | 1 |
| Mining | 1 |
| Nautical | 1 |
| Navigation | 2 |
| Technology | 9 |
| Telecommunications | 2 |
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