10个人两两一组有多少个组合

简介：Two days later, Li Dao walked out of the tent with a radiant face. It was already dark now. He counted the time silently, and it should be around three o'clock in the morning. He couldn't help but let out a sigh of relief. After several days of hard training, his realm was now stable. , Demonic Barrier Refining, no need to worry anymore.