c-- ccc ccd cck cco ccr ccs cdc cdd cdk cdo cdr cds cdy ckc ckd cko cks cky co- coc cod cok coo cor cos coy crc crd crk cro crr crs cry csc csd csk cso csr css csy cyc cyd cyk cyo cyr cys dcc dcd dck dco dcr dcs ddc ddd ddk ddo ddr dds ddy dkc dkk dko dkr dks doc dod dok doo dor dos doy drc drd drk dro drr drs dry dsc dsd dsk dso dsr dss dsy dy- dyc dyd dyk dyo dyr dys dyy kcc kcd kck kcr kcs kdc kdk kdo kdr kds kdy kkc kkk kkr kks kky koc kod kok koo kor kos koy krc krd krk kro krr krs kry ksc ksd ksk kso ksr kss kyc kyd kyo kyr kys oc- occ ocd ock oco ocr ocs odc odd odo odr ods okc okd okk oko okr oks oo- ooc ood ook ooo oor oos or- orc ord ork oro orr ors ory os- osc osd osk oso osr oss oyd oyo oys rcc rcd rco rcr rcs rdc rdd rdo rdr rds rdy rkc rkk rko rks rky roc rod rok roo ror ros roy rrc rrd rrk rrr rrs rsc rsd rsk rso rsr rss ry- ryc ryd ryk ryo ryr rys ryy scc scd sck sco scr scs sdc sdd sdk sdo sdr sds sdy sk- skc skd skk sko skr sks sky soc sod sok soo sor sos soy sr- src srd srk sro srr srs sry ss- ssc ssd ssk sso ssr sss sy- syc syd syk syr sys ycc ycd yco ycs ycy ydo yds ydy ykk yoc yod yok yoo yor yos yoy yrc yro yrs ysc ysk yso ysr yss ysy yyc yys yyy