A,B,C,D,E,F六个人站一排，A,B必须相邻，C,D不相邻，E,F不能在两端。求有多少种排法？

{{A,B,C,E,F,D},{B,A,C,E,F,D},{A,B,D,E,F,C},{B,A,D,E,F,C},{A,B,C,F,E,D},{B,A,C,F,E,D},{A,B,D,F,E,C},{B,A,D,F,E,C},{C,A,B,E,F,D},{C,B,A,E,F,D},{D,A,B,E,F,C},{D,B,A,E,F,C},{C,A,B,F,E,D},{C,B,A,F,E,D},{D,A,B,F,E,C},{D,B,A,F,E,C},{C,E,A,B,F,D},{C,E,B,A,F,D},{D,E,A,B,F,C},{D,E,B,A,F,C},{C,F,A,B,E,D},{C,F,B,A,E,D},{D,F,A,B,E,C},{D,F,B,A,E,C},{C,E,F,A,B,D},{C,E,F,B,A,D},{D,E,F,A,B,C},{D,E,F,B,A,C},{C,F,E,A,B,D},{C,F,E,B,A,D},{D,F,E,A,B,C},{D,F,E,B,A,C},{C,E,F,D,A,B},{C,E,F,D,B,A},{D,E,F,C,A,B},{D,E,F,C,B,A},{C,F,E,D,A,B},{C,F,E,D,B,A},{D,F,E,C,A,B},{D,F,E,C,B,A}}
共计：40种

一共6种，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，，