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control number : 71 phrases in 13 subjects |
Automobiles | 2 |
Aviation | 33 |
Bridge card game | 1 |
Business | 4 |
Economics | 2 |
Electronics | 7 |
General | 1 |
Geophysics | 1 |
Librarianship | 4 |
Mechanics | 1 |
Oil / petroleum | 1 |
Space | 4 |
Technology | 10 |