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radar tracking : 171 phrases in 10 subjects |
| Air defense | 38 |
| Aviation | 27 |
| Earth sciences | 3 |
| Electronics | 25 |
| General | 2 |
| Missiles | 1 |
| Remote sensing | 1 |
| Space | 56 |
| Technology | 17 |
| United States | 1 |
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