a-a a-b a-i aaa aab aai aam aan aar ab- aba abb abi abm abn abr ai- aia aib aii aim ain air ama amb ami amm amn amr an- ana anb ani anm ann anr ar- ara arb ari arm arn arr baa bab bai bam ban bar bba bbb bbi bbm bbn bbr bi- bia bib bii bim bin bir bma bmb bmi bmm bmn bmr bna bnb bni bnn bnr bra brb bri brm brn brr ia- iaa iab iai iam ian iar iba ibb ibi ibm ibn ibr iia iib iii iim iin iir im- ima imb imi imm imn in- ina inb ini inm inn inr ir- ira irb iri irm irn irr m-r maa mab mai mam man mar mba mbb mbi mbm mbr mi- mia mib mii mim min mir mma mmb mmi mmm mmn mmr mna mnb mni mnm mnn mnr mra mrb mri mrm mrn mrr n-i naa nab nai nam nan nar nba nbb nbi nbm nbn nbr nia nib nii nim nin nir nma nmb nmi nmm nmn nmr nna nnb nni nnm nnn nra nrb nri nrm nrn nrr ra- raa rab rai ram ran rar rba rbb rbi rbm rbn rbr ria rib rii rim rin rir rma rmb rmi rmm rmn rmr rna rnb rni rnm rnn rnr rra rrb rri rrm rrn rrr