#NEXUS BEGIN DATA; DIMENSIONS NTAX=4 NCHAR=2 ; FORMAT DATATYPE=STANDARD SYMBOLS=" 0 1" MISSING=? GAP=- ; MATRIX Sclerocephalus 00 Glaukerpeton 10 Onchiodon 11 Eryops 11 ; END; BEGIN ASSUMPTIONS; OPTIONS DEFTYPE=unord PolyTcount=MINSTEPS ; END;