MAYBE
0.09/0.19	MAYBE
0.09/0.19	
0.09/0.19	Problem:
0.09/0.19	 eq(0(),0()) -> true()
0.09/0.19	 eq(0(),s(x)) -> false()
0.09/0.19	 eq(s(x),0()) -> false()
0.09/0.19	 eq(s(x),s(y)) -> eq(x,y)
0.09/0.19	 or(true(),y) -> true()
0.09/0.19	 or(false(),y) -> y
0.09/0.19	 union(empty(),h) -> h
0.09/0.19	 union(edge(x,y,i),h) -> edge(x,y,union(i,h))
0.09/0.19	 isEmpty(empty()) -> true()
0.09/0.19	 isEmpty(edge(x,y,i)) -> false()
0.09/0.19	 from(edge(x,y,i)) -> x
0.09/0.19	 to(edge(x,y,i)) -> y
0.09/0.19	 rest(edge(x,y,i)) -> i
0.09/0.19	 rest(empty()) -> empty()
0.09/0.19	 reach(x,y,i,h) -> if1(eq(x,y),isEmpty(i),eq(x,from(i)),eq(y,to(i)),x,y,i,h)
0.09/0.19	 if1(true(),b1,b2,b3,x,y,i,h) -> true()
0.09/0.19	 if1(false(),b1,b2,b3,x,y,i,h) -> if2(b1,b2,b3,x,y,i,h)
0.09/0.19	 if2(true(),b2,b3,x,y,i,h) -> false()
0.09/0.19	 if2(false(),b2,b3,x,y,i,h) -> if3(b2,b3,x,y,i,h)
0.09/0.19	 if3(false(),b3,x,y,i,h) -> reach(x,y,rest(i),edge(from(i),to(i),h))
0.09/0.19	 if3(true(),b3,x,y,i,h) -> if4(b3,x,y,i,h)
0.09/0.19	 if4(true(),x,y,i,h) -> true()
0.09/0.19	 if4(false(),x,y,i,h) -> or(reach(x,y,rest(i),h),reach(to(i),y,union(rest(i),h),empty()))
0.09/0.19	
0.09/0.19	Proof:
0.09/0.19	 Open
0.09/0.19	EOF