Ltac get_invariant_pre inv :=
    match goal with
      | H : raft_intermediate_reachable _ |- _=>
        match (type of H) with
          | context [mkNetwork] =>
            fail 2
        end || copy_apply inv H
    end.Ltac get_invariant_post inv :=
    match goal with
      | H : raft_intermediate_reachable _ |- _=>
        match (type of H) with
          | context [mkNetwork] =>
            copy_apply inv H            
        end
    end.Definition clientCache_to_ks (c : list (clientId * (nat * output))) :=
    map (fun e => (fst e, fst (snd e))) c.

Lemma log_to_ks'_assoc_set_diff : forall l ks k v k', k <> k' -> assoc clientId_eq_dec (log_to_ks' l (assoc_set clientId_eq_dec ks k v)) k' = assoc clientId_eq_dec (log_to_ks' l ks) k'.