#NEXUS BEGIN DATA; DIMENSIONS NTAX=4 NCHAR=2 ; FORMAT DATATYPE=STANDARD SYMBOLS=" 0 1" MISSING=? GAP=- ; MATRIX Actinodontidae 00 Dissorophoidea 11 Zatrachydidae 11 Eryopidae 01 ; END; BEGIN ASSUMPTIONS; OPTIONS DEFTYPE=unord PolyTcount=MINSTEPS ; END;