d(iron, steam).
d(steam, electricity).

depends(X,Y) :-
	d(X,Y).
depends(X, Z) :-
	d(X, Y), depends(Y, Z).

spotted(baby).
lethal(baby).

mmember(A, [A|R]).
mmember(X, [H|T]) :- mmember(X, T).

tripple([a,b,c]).

odds([], []).
odds([A,B|C], ANS) :- odds(C, [A,C]).
