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