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| tetrad; quartet | |||
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四分子 : 60 phrases in 16 subjects |
| Agriculture | 20 |
| Animal husbandry | 1 |
| Automobiles | 3 |
| Botany | 1 |
| Chemistry | 2 |
| Chess | 1 |
| Desert science | 2 |
| Earth sciences | 1 |
| General | 9 |
| Genetics | 8 |
| Life sciences | 5 |
| Mycology | 1 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Scientific | 1 |
| Technology | 2 |
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