#NEXUS BEGIN DATA; DIMENSIONS NTAX=8 NCHAR=6 ; FORMAT DATATYPE=STANDARD SYMBOLS=" 0 1" MISSING=? GAP=- ; MATRIX Caseasauria 000000 Varanopseidae 100000 Archaeothyris 111000 Ophiacodon 111100 Varanosaurus 111100 Edaphosauridae 101010 Haplodus 101011 Sphenaoodontoidea 101011 ; END; BEGIN ASSUMPTIONS; OPTIONS DEFTYPE=unord PolyTcount=MINSTEPS ; END;