fact: Axiom todo3 : forall (s2 : Site) (q0 q1 q2 : queue Message), In_queue Message (inc_dec s2) (append Message q0 (input Message dec (append Message q1 (input Message (inc_dec s2) q2)))).
imports: DistributedReferenceCounting.machine3.machine DistributedReferenceCounting.machine3.cardinal DistributedReferenceCounting.machine3.comm