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联结、添加(加号). 表1a
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连续延长(斜线). 表1a
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简单关系(冒号). 表1b
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固定排序(双冒号). 表1b
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子类(方括号). 表1b
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引出非UDC号码(星号). 表1h
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直接按字母顺序排序. 表1h
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