a-a a-b a-i aaa aab aai aak aam aao aar ab- aba abb abi abk abm abo abr ai- aia aib aii aik aim aio air aka akb aki akk akm ako akr ama amb ami amk amm amo amr aoa aob aoi aok aom aoo aor ar- ara arb ari ark arm aro arr baa bab bai bak bam bao bar bba bbb bbi bbk bbm bbo bbr bi- bia bib bii bik bim bio bir bka bkb bkk bkm bko bkr bma bmb bmi bmk bmm bmo bmr boa bob boi bok bom boo bor bra brb bri brk brm bro brr ia- iaa iab iai iam iao iar iba ibb ibi ibk ibm ibo ibr iia iib iii iim iio iir ika ikb iki ikk iko ikr im- ima imb imi imm imo io- ioa iob ioi iom ioo ior ir- ira irb iri irk irm iro irr ka- kaa kab kai kak kam kao kar kba kbb kbi kbk kbm kbo kbr kia kib kii kik kim kio kir kkb kki kkk kkm kkr kma kmb kmi kmk kmm kmo koa kob koi kok kom koo kor kra kri krk kro krr m-o m-r maa mab mai mak mam mao mar mba mbb mbi mbk mbm mbo mbr mi- mia mib mii mik mim mio mir mka mkb mkk mkm mko mkr mma mmb mmi mmk mmm mmo mmr moa mob moi mok mom moo mor mra mrb mri mrk mrm mro mrr o-i oaa oab oai oak oam oao oar ob- oba obb obi obk obm obo obr oia oib oii oik oim oio oir oka okb oki okk oko okr om- oma omb omi omm omo omr oo- ooa oob ooi ook oom ooo oor or- ora orb ori ork orm oro orr ra- raa rab rai rak ram rao rar rba rbb rbi rbk rbm rbo rbr ria rib rii rik rim rio rir rkb rkk rkm rko rma rmb rmi rmm rmo rmr roa rob roi rok rom roo ror rra rrb rri rrk rrm rrr