sentences:  Japanese historians like Uematsu, Sugiyama and Morita criticized the perception that a four class system existed under Mongol rule and Funada Yoshiyuki questioned the very existence of the Semu as a class.The Yuan dynasty "Han people" classification included Koreans, Bohais, Jurchens and Khitans, and they are included in statistics of intermarriage between Semu and "Han people".Semu and Han intermarried with Mongols.