參考答案：
單選
1-10? cccba acaac
11-20 ccccb ccabb
21-30 babbb cbbbb
31-40 aacca bcbcb
41-50 bbcab aaabb
多選
1-5???? abcd?? abc?? abc? ac? abcd
6-10?? abcd abcd? abd ab? abc
11-15 abc?? ab? abcd? abd? ad
判斷
1-10? 11111 11101
11-20 00101 10100