-ic c-- ccc cci cck cco ccr ccs cct ci- cic cii cik cio cir cis cit ckc cki cko cks ckt co- coc coi cok coo cor cos cot crc cri crk cro crr crs crt csc csi csk cso csr css cst ctc cti ctk cto ctr cts ctt icc ici ick ico icr ics ict iic iii iio iir iis iit ikc iki ikk iko ikr iks ikt io- ioc ioi ioo ior ios iot ir- irc iri irk iro irr irs irt is- isc isi isk iso isr iss ist itc iti itk ito its itt k-t kcc kci kck kcr kcs kct kic kii kik kio kir kis kit kkc kki kkk kkr kks kkt koc koi kok koo kor kos kot krc kri krk kro krr krs krt ksc ksi ksk kso ksr kss kst ktc ktk kto ktr kts ktt o-i oc- occ oci ock oco ocr ocs oct oic oii oik oio oir ois oit okc oki okk oko okr oks oo- ooc ooi ook ooo oor oos oot or- orc ori ork oro orr ors ort os- osc osi osk oso osr oss ost ot- otc oti otk oto otr ots ott rcc rci rco rcr rcs rct ric rii rik rio rir ris rit rkc rkk rko rks rkt roc roi rok roo ror ros rot rrc rri rrk rrr rrs rrt rsc rsi rsk rso rsr rss rst rtc rti rtk rto rtr rts rtt scc sci sck sco scr scs sct sic sii sik sio sir sis sit sk- skc ski skk sko skr sks skt soc soi sok soo sor sos sot sr- src sri srk sro srr srs srt ss- ssc ssi ssk sso ssr sss sst stc sti stk sto str sts stt tcc tci tck tco tcr tcs tct tic tii tik tio tir tis tit tkc tkk tko tkr tks tkt to- toc toi tok too tor tos tot trc tri trk tro trr trs trt tsc tsi tsk tso tsr tss tst ttc tti ttk tto ttr tts ttt