c-- ccc cck ccm cco ccr ccs cct ckc ckm cko cks ckt cmc cmk cmm cmo cmr cms cmt co- coc cok com coo cor cos cot crc crk crm cro crr crs crt csc csk csm cso csr css cst ctc ctk ctm cto ctr cts ctt k-t kcc kck kcm kcr kcs kct kkc kkk kkm kkr kks kkt kmc kmk kmm kmo kms kmt koc kok kom koo kor kos kot krc krk kro krr krs krt ksc ksk ksm kso ksr kss kst ktc ktk ktm kto ktr kts ktt m-o m-r mc- mcc mck mcm mco mcr mcs mct mkc mkk mkm mko mkr mks mkt mmc mmk mmm mmo mmr mms mmt moc mok mom moo mor mos mot mrc mrk mrm mro mrr mrs mrt msc msk msm mso msr mss mst mtc mtk mtm mto mtr mts mtt oc- occ ock ocm oco ocr ocs oct okc okk oko okr oks om- omc omm omo omr oms omt oo- ooc ook oom ooo oor oos oot or- orc ork orm oro orr ors ort os- osc osk osm oso osr oss ost ot- otc otk otm oto otr ots ott rcc rcm rco rcr rcs rct rkc rkk rkm rko rks rkt rmc rmm rmo rmr rms rmt roc rok rom roo ror ros rot rrc rrk rrm rrr rrs rrt rsc rsk rsm rso rsr rss rst rtc rtk rtm rto rtr rts rtt scc sck scm sco scr scs sct sk- skc skk skm sko skr sks skt smc smk smm smo smr sms smt soc sok som soo sor sos sot sr- src srk srm sro srr srs srt ss- ssc ssk ssm sso ssr sss sst stc stk stm sto str sts stt tcc tck tcm tco tcr tcs tct tkc tkk tkm tko tkr tks tkt tmc tmk tmm tmo tmr tms tmt to- toc tok tom too tor tos tot trc trk trm tro trr trs trt tsc tsk tsm tso tsr tss tst ttc ttk ttm tto ttr tts ttt