a-a a-c aaa aac aak aam aao aar ac- aca acc ack acm aco acr aka akc akk akm ako akr ama amc amk amm amo amr aoa aoc aok aom aoo aor ar- ara arc ark arm aro arr c-- caa cac cak cam cao car cca ccc cck ccm cco ccr cka ckc ckm cko cma cmc cmk cmm cmo cmr co- coa coc cok com coo cor cra crc crk crm cro crr ka- kaa kac kak kam kao kar kca kcc kck kcm kcr kkc kkk kkm kkr kma kmc kmk kmm kmo koa koc kok kom koo kor kra krc krk kro krr m-o m-r maa mac mak mam mao mar mc- mca mcc mck mcm mco mcr mka mkc mkk mkm mko mkr mma mmc mmk mmm mmo mmr moa moc mok mom moo mor mra mrc mrk mrm mro mrr oaa oac oak oam oao oar oc- oca occ ock ocm oco ocr oka okc okk oko okr om- oma omc omm omo omr oo- ooa ooc ook oom ooo oor or- ora orc ork orm oro orr ra- raa rac rak ram rao rar rca rcc rcm rco rcr rkc rkk rkm rko rma rmc rmm rmo rmr roa roc rok rom roo ror rra rrc rrk rrm rrr