#NEXUS BEGIN DATA; DIMENSIONS NTAX=6 NCHAR=4; FORMAT SYMBOLS= " 0 1" MISSING=? GAP=- ; MATRIX Dendrerpeton 0000 Acanthostomatops 0111 Cheliderpeton 1011 Onchiodon 0111 Apateon 0001 Parotosuchus 1011 ; END; BEGIN ASSUMPTIONS; OPTIONS DEFTYPE=unord PolyTcount=MINSTEPS ; END;