eq(f0(A,B,C),1,[f2(A,B,C,D,E,F,G),loop_cont_f2(E,F,G)],[D=0,A>=0,B>=C]).
eq(f0(A,B,C),1,[f2(A,B,C,D,E,F,G)],[D=1,A>=0,B>=C]).
eq(f2(A,B,C,D,E,F,G),1,[f2(A-1,B,C-1,D,E,F,G)],[A>=1,B+1>=C]).
eq(f2(A,B,C,D,E,F,G),1,[f2(A,B+C-1,C-1,D,E,F,G)],[A>=0,B>=0]).
eq(f2(A,B,C,D,A,B,C),0,[],[D=1]).