Comment: Cf. Lezg. erg. tiṗ-re (this, together with Tab. ṭip:-ru and Rut. ṭɨb-ɨr- points to a PL oblique base in *-rV-). 3d class in Rut. and Kryz. Since the root is not preserved in Arch., Tsakh. or Udi, it is impossible to distinguish between PL *-m:- and *-p:-; external evidence is strongly in favour of *-m:-.
