Proof using.
intros.
find_apply_lem_hyp applyEntries_spec.
break_exists. subst. eauto.
Qed.

(* Specifications: *)
Lemma handleClientRequest_commitIndex :
forall h st client id c out st' l,
handleClientRequest h st client id c = (out, st', l) ->
commitIndex st' = commitIndex st.