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reduction/oxidation : 98 phrases in 20 subjects |
| Agriculture | 5 |
| Automobiles | 4 |
| Chemistry | 6 |
| Desert science | 4 |
| Earth sciences | 3 |
| Ecology | 3 |
| Electronics | 4 |
| Engineering geology | 1 |
| Environment | 1 |
| General | 4 |
| Geophysics | 1 |
| Life sciences | 1 |
| Metallurgy | 9 |
| Oil / petroleum | 5 |
| Oil processing plants | 1 |
| Plastics | 5 |
| Polymers | 5 |
| Sports | 3 |
| Technology | 27 |
| Water resources | 6 |
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