a-a a-c aaa aac aam aao aar aas ac- aca acc acm aco acr acs ama amc amm amo amr ams aoa aoc aom aoo aor aos ar- ara arc arm aro arr ars as- asa asc asm aso asr ass c-- caa cac cam cao car cas cca ccc ccm cco ccr ccs cma cmc cmm cmo cmr cms co- coa coc com coo cor cos cra crc crm cro crr crs csa csc csm cso csr css m-o m-r maa mac mam mao mar mas mc- mca mcc mcm mco mcr mcs mma mmc mmm mmo mmr mms moa moc mom moo mor mos mra mrc mrm mro mrr mrs msa msc msm mso msr mss oaa oac oam oao oar oas oc- oca occ ocm oco ocr ocs om- oma omc omm omo omr oms oo- ooa ooc oom ooo oor oos or- ora orc orm oro orr ors os- osa osc osm oso osr oss ra- raa rac ram rao rar ras rca rcc rcm rco rcr rcs rma rmc rmm rmo rmr rms roa roc rom roo ror ros rra rrc rrm rrr rrs rsa rsc rsm rso rsr rss saa sac sam sao sar sas sca scc scm sco scr scs sma smc smm smo smr sms soa soc som soo sor sos sr- sra src srm sro srr srs ss- ssa ssc ssm sso ssr sss