(1) :B, D, E
(2) :A, B, C
(3) :B, D
(4) :C, D
(5) :B, C, D, E
(6) :C, D, E
(7) :B, C, E
(8) :B, D, E
(9) :A, D, E
(10) :A, B, D, E
(11) :B, C, D, E
(12) :A, B, C, D
(13) :A, C, D, E
(14) :A, C, D, E
(15) :B, C, E
16.ACDE
17.ABCE
18.ABDE
19.ABCD
20.ABC