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tech.
light frequency
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52 phrases
in 17 subjects
Agriculture
1
Air defense
1
Automobiles
2
Aviation
1
Computer networks
1
Earth sciences
1
Electronics
6
General
1
Geophysics
3
Information technology
1
Metallurgy
1
Nursing
1
Oil / petroleum
1
Space
4
Sports
2
Technology
23
Telecommunications
2
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