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不规四边形 : 19 phrases in 10 subjects |
| Architecture | 3 |
| Automobiles | 2 |
| Aviation | 3 |
| Bridge construction | 1 |
| Electronics | 2 |
| General | 2 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |
| United Kingdom | 2 |
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