-ic c-- ccc cci cck cco ccr ccs ci- cic cii cik cio cir cis ckc cki cko cks co- coc coi cok coo cor cos crc cri crk cro crr crs csc csi csk cso csr css icc ici ick ico icr ics iic iii iio iir iis ikc iki ikk iko ikr iks io- ioc ioi ioo ior ios ir- irc iri irk iro irr irs is- isc isi isk iso isr iss kcc kci kck kcr kcs kic kii kik kio kir kis kkc kki kkk kkr kks koc koi kok koo kor kos krc kri krk kro krr krs ksc ksi ksk kso ksr kss o-i oc- occ oci ock oco ocr ocs oic oii oik oio oir ois okc oki okk oko okr oks oo- ooc ooi ook ooo oor oos or- orc ori ork oro orr ors os- osc osi osk oso osr oss rcc rci rco rcr rcs ric rii rik rio rir ris rkc rkk rko rks roc roi rok roo ror ros rrc rri rrk rrr rrs rsc rsi rsk rso rsr rss scc sci sck sco scr scs sic sii sik sio sir sis sk- skc ski skk sko skr sks soc soi sok soo sor sos sr- src sri srk sro srr srs ss- ssc ssi ssk sso ssr sss