c-- ccc ccm cco ccr ccs cct cmc cmm cmo cmr cms cmt co- coc com coo cor cos cot crc crm cro crr crs crt csc csm cso csr css cst ctc ctm cto ctr cts ctt m-o m-r mc- mcc mcm mco mcr mcs mct mmc mmm mmo mmr mms mmt moc mom moo mor mos mot mrc mrm mro mrr mrs mrt msc msm mso msr mss mst mtc mtm mto mtr mts mtt oc- occ ocm oco ocr ocs oct om- omc omm omo omr oms omt oo- ooc oom ooo oor oos oot or- orc orm oro orr ors ort os- osc osm oso osr oss ost ot- otc otm oto otr ots ott rcc rcm rco rcr rcs rct rmc rmm rmo rmr rms rmt roc rom roo ror ros rot rrc rrm rrr rrs rrt rsc rsm rso rsr rss rst rtc rtm rto rtr rts rtt scc scm sco scr scs sct smc smm smo smr sms smt soc som soo sor sos sot sr- src srm sro srr srs srt ss- ssc ssm sso ssr sss sst stc stm sto str sts stt tcc tcm tco tcr tcs tct tmc tmm tmo tmr tms tmt to- toc tom too tor tos tot trc trm tro trr trs trt tsc tsm tso tsr tss tst ttc ttm tto ttr tts ttt