a-a a-b a-i aaa aab aai aam aan aao aar ab- aba abb abi abm abn abo abr ai- aia aib aii aim ain aio air ama amb ami amm amn amo amr an- ana anb ani anm ann ano anr aoa aob aoi aom aon aoo aor ar- ara arb ari arm arn aro arr baa bab bai bam ban bao bar bba bbb bbi bbm bbn bbo bbr bi- bia bib bii bim bin bio bir bma bmb bmi bmm bmn bmo bmr bna bnb bni bnn bno bnr boa bob boi bom bon boo bor bra brb bri brm brn bro brr ia- iaa iab iai iam ian iao iar iba ibb ibi ibm ibn ibo ibr iia iib iii iim iin iio iir im- ima imb imi imm imn imo in- ina inb ini inm inn ino inr io- ioa iob ioi iom ion ioo ior ir- ira irb iri irm irn iro irr m-o m-r maa mab mai mam man mao mar mba mbb mbi mbm mbo mbr mi- mia mib mii mim min mio mir mma mmb mmi mmm mmn mmo mmr mna mnb mni mnm mnn mno mnr moa mob moi mom mon moo mor mra mrb mri mrm mrn mro mrr n-i naa nab nai nam nan nao nar nba nbb nbi nbm nbn nbo nbr nia nib nii nim nin nio nir nma nmb nmi nmm nmn nmo nmr nna nnb nni nnm nnn nno no- noa nob noi nom non noo nor nra nrb nri nrm nrn nro nrr o-i oaa oab oai oam oan oao oar ob- oba obb obi obm obn obo obr oia oib oii oim oin oio oir om- oma omb omi omm omn omo omr on- ona onb oni onn ono onr oo- ooa oob ooi oom oon ooo oor or- ora orb ori orm orn oro orr ra- raa rab rai ram ran rao rar rba rbb rbi rbm rbn rbo rbr ria rib rii rim rin rio rir rma rmb rmi rmm rmn rmo rmr rna rnb rni rnm rnn rno rnr roa rob roi rom ron roo ror rra rrb rri rrm rrn rrr