%, copy_term(X,Y), writeln('....'), writeln(X), writeln(Y).

:- linitialization(main).

main :-
	main( cyclic_term(X), X).
main :-
	writeln('-----------------------'),
	fail.
main :-
	main( ground(X), X).
main :-
	writeln('-----------------------'),
	fail.
main :-
    main2( (terms:variables_in_term(X, O), writeln(X=O) ), X, L, O).
main :-
	writeln('-----------------------'),
	fail.
main :-
    main2( (terms:new_variables_in_term(L,X, O), writeln(X+L=O) ), X, L, O).
main :-
	writeln('-----------------------'),
	fail.
main :-
    main2( (terms:variables_within_term(L,X, O), writeln(X+L=O) ), X, L, O).
main :-
	writeln('-----------------------'),
	fail.
main :-
    main( writeln(X), X).
main :-
	writeln('-----------------------'),
	fail.
main :-
	main((rational_term_to_tree(X,A,B,[]), numbervars(A+B,1,_),
	      writeln((A->B))), X).
main.

main(G, X) :-
	d(X),
	m(G).


main2(G, X, L, O) :-
	e(X,L),
	m(G).

m( G ) :-
	G,
	!,
	writeln(yes),
	end.
m( G ) :-
	writeln(no),
	end.

d(X) :- X = [_A].
d(X) :- X = [a,_A].
d(X) :- X = [X].
d(X) :- X = [_|X].
d(X) :- X = [_,X].
d(X) :- X = [_,x].
d(X) :- X = [_,x(X)].
d(X) :- X= f(X).
d(X) :- X= f(X,X).
d(X) :- X= f(_,X).
d(X) :- X= f(A,A,X).
d(X) :- X= f(A,A,g(A)).
d(X) :- X= f(A,g(X,[A|A]),X).
d(X) :- X= f(X,[X,X]).
d(X) :- X= f(X,[X,g(X)]).
d(X) :- X= f(_,X/[X]).
d(X) :- X= f(_,A/[A]), A= f(X,[X,g(X)]).
d(X) :- X= f(_,A/[A]), A= f(X,[A,g(X)]).
d(X) :- X= f(_,A/[A]), A= f(B,[X,g(A)]), B=[C|B], C=[X].

end :- writeln('....'), fail.

e(X,Y) :- X = t(_A,B,_C,D), Y = [B,E].
e(X,Y) :- X = t(_A,_B,_C,_D), Y = [_,_E].
e(X,Y) :- X = t(A,_B,C,_D), Y = [ A,C].
e(X,Y) :- X = t(A,[X,_D]), Y = [A,_C,_E].
e(X,Y) :- X = t(A,[X,C]), Y = [A,C,_E].
e(X,Y) :- X = t(A,X,_B,[X,C,_D]), Y = [A,C,E].


a(no,   no).
a(no,   no).
a(yes, yes).
a(yes,  no).
a(yes,  no).
a( no,  no).
a(yes,  no).
a(yes, yes).
a(yes, yes).
a(yes,  no).
a(yes,  no).
a( no,  no).
a(yes,  no).
a(yes, yes).
a(yes, yes).
a(yes,  no).
a(yes,  no).