Lemma isaset_TRRGraphData (V : hSet) : isaset (TRRGraphData V). Proof. unfold TRRGraphData. apply (isofhleveltotal2 2). - apply isaset_hrel. - intros x. apply (isofhleveltotal2 2). -- apply setproperty. -- intros. apply hlevelntosn. apply isaprop_isTRR. Qed.