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|
echo ranging : 59 phrases in 15 subjects |
| Acoustics | 3 |
| Biology | 1 |
| Electronics | 2 |
| Fish farming pisciculture | 2 |
| Geophysics | 1 |
| Hydrology | 1 |
| Makarov | 3 |
| Military | 5 |
| Nautical | 15 |
| Navigation | 5 |
| Oceanography & oceanology | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 15 |
| Transport | 3 |