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二次形 : 36 phrases in 10 subjects |
| Automobiles | 1 |
| Business | 4 |
| General | 3 |
| Mathematics | 1 |
| Metallurgy | 5 |
| Oil / petroleum | 1 |
| Plastic surgery | 1 |
| Space | 1 |
| Statistics | 1 |
| Technology | 18 |
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