:- dynamic rule/2.

:- table interp_g/1.

interp([]).
interp([G|Gs]) :- interp_g(G),interp(Gs).
interp_g(tnot(G)) :- tnot(interp_g(G)).
interp_g(G) :- rule(G,B),interp(B).

%-------------------------------------------------------------------------------

test :- new_program, query(Goal), interp_g(Goal), fail.
test :- writeln('Program interp1 finished execution...').

%-------------------------------------------------------------------------------

new_program :- cleanup, assert(query(p)),
	assert(rule(p, [tnot(q),p])),
	assert(rule(q, [tnot(q),p])),
	assert(rule(q, [tnot(p)])).
new_program :- cleanup, assert(query(q)),
	assert(rule(p, [tnot(q), p])),
	assert(rule(q, [tnot(p), q])),
	assert(rule(p, [tnot(p)])).
new_program :- cleanup, assert(query(p)),
	assert(rule(p, [tnot(q), p])),
	assert(rule(q, [tnot(p), q])),
	assert(rule(q, [tnot(p)])).

cleanup :- retractall(query(_)), retractall(rule(_,_)), abolish_all_tables.