四个数字有多少种组合方式

简介：Jiang Mingyi deeply felt Liu Weiye's life-saving grace, and Jiang Mingyi was eloquent, so the two became brothers of the opposite sex. They made an oath to share blessings and share hardships. They did not wish to be born in the same year and the same month, but they wished to die in the same year and the same month.