a-a a-c aaa aac aak aam aan aao aar ac- aca acc ack acm acn aco acr aka akc akk akm akn ako akr ama amc amk amm amn amo amr an- ana anc ank anm ann ano anr aoa aoc aok aom aon aoo aor ar- ara arc ark arm arn aro arr c-- caa cac cak cam can cao car cca ccc cck ccm ccn cco ccr cka ckc ckm cko cma cmc cmk cmm cmn cmo cmr cn- cna cnc cnm cnn cno cnr co- coa coc cok com con coo cor cra crc crk crm crn cro crr ka- kaa kac kak kam kan kao kar kca kcc kck kcm kcn kcr kkc kkk kkm kkn kkr kma kmc kmk kmm kmo kn- kna knc knk knm knn kno knr koa koc kok kom kon koo kor kra krc krk krn kro krr m-o m-r maa mac mak mam man mao mar mc- mca mcc mck mcm mcn mco mcr mka mkc mkk mkm mkn mko mkr mma mmc mmk mmm mmn mmo mmr mna mnc mnk mnm mnn mno mnr moa moc mok mom mon moo mor mra mrc mrk mrm mrn mro mrr naa nac nak nam nan nao nar nca ncc nck ncm ncn nco ncr nka nkc nkk nkm nkn nko nkr nma nmc nmk nmm nmn nmo nmr nna nnc nnk nnm nnn nno no- noa noc nok nom non noo nor nra nrc nrk nrm nrn nro nrr oaa oac oak oam oan oao oar oc- oca occ ock ocm ocn oco ocr oka okc okk oko okr om- oma omc omm omn omo omr on- ona onc onk onn ono onr oo- ooa ooc ook oom oon ooo oor or- ora orc ork orm orn oro orr ra- raa rac rak ram ran rao rar rca rcc rcm rcn rco rcr rkc rkk rkm rko rma rmc rmm rmn rmo rmr rna rnc rnm rnn rno rnr roa roc rok rom ron roo ror rra rrc rrk rrm rrn rrr