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| 钻石形记号; 钻石形记号以计算击球角度 | |||
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diamond system : 7 phrases in 6 subjects |
| Bridge card game | 1 |
| Earth sciences | 1 |
| General | 2 |
| Mechanics | 1 |
| Oil / petroleum | 1 |
| Technology | 1 |
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