c-- ccc ccd cck ccn cco ccr ccs cdc cdd cdk cdn cdo cdr cds ckc ckd cko cks cn- cnc cnd cnn cno cnr cns co- coc cod cok con coo cor cos crc crd crk crn cro crr crs csc csd csk csn cso csr css dcc dcd dck dcn dco dcr dcs ddc ddd ddk ddn ddo ddr dds dkc dkk dko dkr dks dnc dnd dnk dnn dno dnr dns doc dod dok don doo dor dos drc drd drk drn dro drr drs dsc dsd dsk dsn dso dsr dss kcc kcd kck kcn kcr kcs kdc kdk kdo kdr kds kkc kkk kkn kkr kks kn- knc knd knk knn kno knr koc kod kok kon koo kor kos krc krd krk krn kro krr krs ksc ksd ksk ksn kso ksr kss ncc ncd nck ncn nco ncr ncs ndc ndd ndk ndn ndo ndr nds nkc nkk nkn nko nkr nks nnc nnk nnn nno nns no- noc nod nok non noo nor nos nrc nrd nrk nrn nro nrr nrs nsc nsd nsk nsn nso nsr nss oc- occ ocd ock ocn oco ocr ocs odc odd odn odo odr ods okc okd okk oko okr oks on- onc ond onk onn ono onr ons oo- ooc ood ook oon ooo oor oos or- orc ord ork orn oro orr ors os- osc osd osk osn oso osr oss rcc rcd rcn rco rcr rcs rdc rdd rdn rdo rdr rds rkc rkk rko rks rnc rnd rnn rno rnr rns roc rod rok ron roo ror ros rrc rrd rrk rrn rrr rrs rsc rsd rsk rsn rso rsr rss scc scd sck scn sco scr scs sdc sdd sdk sdn sdo sdr sds sk- skc skd skk sko skr sks snc snd snk snn sno snr sns soc sod sok son soo sor sos sr- src srd srk srn sro srr srs ss- ssc ssd ssk ssn sso ssr sss