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| 21. | regular substitution group |
| 正则代换群 |
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| 22. | theory of substitution |
| 代换论 |
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| 23. | back substitution |
| 倒转代换 |
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| 24. | substitution forecasting |
| 代换预测法 |
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| 25. | logic schematic replacement |
| 逻辑框图代换 |
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| 26. | hyperbolic substitution |
| 双曲代换 |
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| 27. | fractional linearsubstitution |
| 分式线性代换 |
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| 28. | simple substitution cipher |
| 简单代换密码 |
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| 29. | homophonic substitution cipher |
| 同音代换密码 |
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| 30. | semilinear substitution |
| 半线性代换 |
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