Answer 1 (two possibilities):
A H -> E F A H -> E F
C -> B G H C -> B G H
C D -> E C D -> A
G -> A C G -> A C
Answer 2:
A -> C E
B C -> A D H
B G -> D
F -> B D
Answer 3:
A -> B H
D -> B F G H
H -> E
Answer 4:
A -> F
C -> F
G -> A D E
H -> B
Answer 5 (five possibilities!):
A -> E F G H A -> E G H A -> F G H
C D -> A C D -> A F C D -> A E
H -> B C D H -> B C D H -> B C D
A -> G H A -> G H
C D -> A E F A B -> E
H -> B C D C D -> A F
H -> B C D
Answer 6 (two possibilities):
B -> A D F G H B -> A D E F G H
F -> B E F -> B
Answer 7 (two possibilities):
A C G -> D E A C G -> D E
D -> A C H D -> C H
E H -> B D F -> A
H -> F E H -> B
H -> F
Answer 8:
D -> B E F G
E -> C H
E F -> A
Answer 9:
B F -> G
E -> A H
G -> E
Answer 10:
D -> B E H
E -> F
F -> D G