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cycle of permutation |
排列 环 : 26 phrases in 13 subjects |
Agriculture | 2 |
Automobiles | 1 |
Aviation | 1 |
Business | 3 |
Computers | 1 |
Economy | 1 |
Explosives and Explosive Ordnance Disposal | 2 |
General | 1 |
Genetics | 2 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Space | 2 |
Technology | 7 |