That is the excellent form (or seat) of Udana, as the Brahmanas know. Listen as I say which is distinct from the pairs.
एतद् रूपमुदानस्य परमं ब्राह्मणा विदुः। निर्द्वन्द्वमिति यत् त्वेतत् तन्मे निगदतः शृणु॥