MAYBE
0.08/0.18	MAYBE
0.08/0.18	
0.08/0.18	Problem:
0.08/0.18	 circ(cons(a,s),t) -> cons(msubst(a,t),circ(s,t))
0.08/0.18	 circ(cons(lift(),s),cons(a,t)) -> cons(a,circ(s,t))
0.08/0.18	 circ(cons(lift(),s),cons(lift(),t)) -> cons(lift(),circ(s,t))
0.08/0.18	 circ(circ(s,t),u) -> circ(s,circ(t,u))
0.08/0.18	 circ(s,id()) -> s
0.08/0.18	 circ(id(),s) -> s
0.08/0.18	 circ(cons(lift(),s),circ(cons(lift(),t),u)) -> circ(cons(lift(),circ(s,t)),u)
0.08/0.18	 subst(a,id()) -> a
0.08/0.18	 msubst(a,id()) -> a
0.08/0.18	 msubst(msubst(a,s),t) -> msubst(a,circ(s,t))
0.08/0.18	
0.08/0.18	Proof:
0.08/0.18	 Open
0.08/0.19	EOF