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梁府人
In the third volume, he thinks that the twelve to fifteen year old boys have already had some experience because of the sensory experience, so he mainly discusses the intellectual education for them. In the fourth volume, he thinks that young people between 15 and 20 years old start to enter the society, so he mainly discusses the moral education to them. In the fifth volume, he thinks that because of the need of natural development of young men and women, so mainly discusses the education of women and the love education of young men and women.