a-a a-b a-i aaa aab aai aak aam aan aao aar ab- aba abb abi abk abm abn abo abr ai- aia aib aii aik aim ain aio air aka akb aki akk akm akn ako akr ama amb ami amk amm amn amo amr an- ana anb ani ank anm ann ano anr aoa aob aoi aok aom aon aoo aor ar- ara arb ari ark arm arn aro arr baa bab bai bak bam ban bao bar bba bbb bbi bbk bbm bbn bbo bbr bi- bia bib bii bik bim bin bio bir bka bkb bkk bkm bkn bko bkr bma bmb bmi bmk bmm bmn bmo bmr bna bnb bni bnk bnn bno bnr boa bob boi bok bom bon boo bor bra brb bri brk brm brn bro brr ia- iaa iab iai iam ian iao iar iba ibb ibi ibk ibm ibn ibo ibr iia iib iii iim iin iio iir ika ikb iki ikk iko ikr im- ima imb imi imm imn imo in- ina inb ini ink inm inn ino inr io- ioa iob ioi iom ion ioo ior ir- ira irb iri irk irm irn iro irr ka- kaa kab kai kak kam kan kao kar kba kbb kbi kbk kbm kbn kbo kbr kia kib kii kik kim kin kio kir kkb kki kkk kkm kkn kkr kma kmb kmi kmk kmm kmo kn- kna kni knk knm knn kno knr koa kob koi kok kom kon koo kor kra kri krk krn kro krr m-o m-r maa mab mai mak mam man mao mar mba mbb mbi mbk mbm mbo mbr mi- mia mib mii mik mim min mio mir mka mkb mkk mkm mkn mko mkr mma mmb mmi mmk mmm mmn mmo mmr mna mnb mni mnk mnm mnn mno mnr moa mob moi mok mom mon moo mor mra mrb mri mrk mrm mrn mro mrr n-i naa nab nai nak nam nan nao nar nba nbb nbi nbk nbm nbn nbo nbr nia nib nii nik nim nin nio nir nka nki nkk nkm nkn nko nkr nma nmb nmi nmk nmm nmn nmo nmr nna nnb nni nnk nnm nnn nno no- noa nob noi nok nom non noo nor nra nrb nri nrk nrm nrn nro nrr o-i oaa oab oai oak oam oan oao oar ob- oba obb obi obk obm obn obo obr oia oib oii oik oim oin oio oir oka okb oki okk oko okr om- oma omb omi omm omn omo omr on- ona onb oni onk onn ono onr oo- ooa oob ooi ook oom oon ooo oor or- ora orb ori ork orm orn oro orr ra- raa rab rai rak ram ran rao rar rba rbb rbi rbk rbm rbn rbo rbr ria rib rii rik rim rin rio rir rkb rkk rkm rko rma rmb rmi rmm rmn rmo rmr rna rnb rni rnm rnn rno rnr roa rob roi rok rom ron roo ror rra rrb rri rrk rrm rrn rrr