c-- ccc ccd cco ccr ccs ccu cdc cdd cdo cdr cds cdu co- coc cod coo cor cos cou crc crd cro crr crs cru csc csd cso csr css csu cuc cud cuo cur cus cuu dcc dcd dco dcr dcs dcu ddc ddd ddo ddr dds ddu doc dod doo dor dos dou drc drd dro drr drs dru dsc dsd dso dsr dss dsu duc dud duo dur dus oc- occ ocd oco ocr ocs ocu odc odd odo odr ods odu oo- ooc ood ooo oor oos or- orc ord oro orr ors oru os- osc osd oso osr oss osu ou- ouc oud ouo our ous rcc rcd rco rcr rcs rcu rdc rdd rdo rdr rds rdu roc rod roo ror ros rou rrc rrd rrr rrs rru rsc rsd rso rsr rss rsu ruc rud ruo rur rus ruu scc scd sco scr scs scu sdc sdd sdo sdr sds sdu soc sod soo sor sos sou sr- src srd sro srr srs ss- ssc ssd sso ssr sss ssu suc sud suo sur sus suu ucc ucd uco ucr ucs ucu udc udd udo udr uds udu uoc uod uoo uor uos ur- urc urd uro urr urs uru usc usd uso usr uss usu uuc uur uus uuu