题目：两个乒乓球队进行比赛，各出三人。甲队为a,b,c三人，乙队为x,y,z三人。已抽签决定

　　　比赛名单。有人向队员打听比赛的名单。a说他不和x比，c说他不和x,z比，请编程序找出

　　　三队赛手的名单。 -Title: two table tennis team competition, each of the trio. A team for a, b, c trio, B teams for x, y, z trio. Draw lots to decide the game list. Inquire about the list of the game to players. a said he did not and x is greater than c said he did not x, z than programmed to identify a list of three teams racer.