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| 单位频数，单位频率，组频数 | |||
| 组频率 | |||
| 统组［频］数 | |||
| 组频数; 单位频数; 单位频率 | |||
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class frequency : 6 phrases in 6 subjects |
| Agriculture | 1 |
| Business | 1 |
| Desert science | 1 |
| Pulp and paper industry | 1 |
| Statistics | 1 |
| Technology | 1 |
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