c-- ccc ccd cck cco ccr ccs ccu cdc cdd cdk cdo cdr cds cdu ckc ckd cko cks co- coc cod cok coo cor cos cou crc crd crk cro crr crs cru csc csd csk cso csr css csu cuc cud cuk cuo cur cus cuu dcc dcd dck dco dcr dcs dcu ddc ddd ddk ddo ddr dds ddu dkc dkk dko dkr dks dku doc dod dok doo dor dos dou drc drd drk dro drr drs dru dsc dsd dsk dso dsr dss dsu duc dud duk duo dur dus kcc kcd kck kcr kcs kcu kdc kdk kdo kdr kds kdu kkc kkk kkr kks kku koc kod kok koo kor kos kou krc krd krk kro krr krs kru ksc ksd ksk kso ksr kss ksu kuc kud kuk kur kus kuu oc- occ ocd ock oco ocr ocs ocu odc odd odo odr ods odu okc okd okk oko okr oks oku oo- ooc ood ook ooo oor oos or- orc ord ork oro orr ors oru os- osc osd osk oso osr oss osu ou- ouc oud ouk ouo our ous rcc rcd rco rcr rcs rcu rdc rdd rdo rdr rds rdu rkc rkk rko rks rku roc rod rok roo ror ros rou rrc rrd rrk rrr rrs rru rsc rsd rsk rso rsr rss rsu ruc rud ruk ruo rur rus ruu scc scd sck sco scr scs scu sdc sdd sdk sdo sdr sds sdu sk- skc skd skk sko skr sks sku soc sod sok soo sor sos sou sr- src srd srk sro srr srs ss- ssc ssd ssk sso ssr sss ssu suc sud suk suo sur sus suu ucc ucd uck uco ucr ucs ucu udc udd udk udo udr uds udu ukc ukk ukr uku uoc uod uok uoo uor uos ur- urc urd urk uro urr urs uru usc usd usk uso usr uss usu uuc uur uus uuu