《管子·山至数》
管仲回答说： 一国的国君，生下弟兄十人，就分封为十个国家；生弟兄五人，就分封为五个国家。
管子对曰： 君人之主，弟兄十人，分国为十；兄弟五人，分国为五。
Guan Zhong replied, "When the monarch of a country has ten sons, he establishes ten feudatory states for them; when he has five sons, he establishes five feudatory states.