一．　　用穷举法求解下列问题。

1．班上要在A, B, C, D, E, F 6名同学中选派若干人去参加比赛，综合比较各人的情况，得出选择的条件如下：

a)　　E和F两人中至少去一个；

b)　　C和D两人中去一个；

c)　　D和E要么都去，要么都不去；

d)　　A,B,F三人中要去两个；

e)　　若C不去，则B也不去；

f)　　C和F不能一起去。

请仔细分析上述条件，找出参加比赛的合适人选。

-A. Using brute-force method to solve the following problems. 1. Class in A, B, C, D, E, F 6 classmates in selected certain people to participate in the competition, comprehensive comparison of each situation, draw the selected conditions are as follows: a) E and F are at least two to go a　b) C and D, two to go one　c) D and E are either all go or not to go　d) A, B, F trio go to two　e) If the C do not, then B did not go　f) C and F can not go together. Carefully analyze the above conditions, identify suitable candidates participate in the competition.