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| An airspace of defined dimensions within which a high volume of pilot training or an unusual type of aerial activity may be carried out | |||
| advisory: 18 phrases in 8 subjects |
| Abbreviation | 5 |
| Accounting | 2 |
| Energy industry | 1 |
| International trade | 1 |
| Military | 2 |
| Technology | 2 |
| Trademark | 3 |
| Veterinary medicine | 2 |