-er a-a a-b a-i aaa aab aae aai aam aan aar ab- aba abb abe abi abm abn abr aea aeb aee aei aem aen aer ai- aia aib aie aii aim ain air ama amb ame ami amm amn amr an- ana anb ane ani anm ann anr ar- ara arb are ari arm arn arr baa bab bae bai bam ban bar bba bbb bbe bbi bbm bbn bbr be- bea beb bee bei bem ben ber bi- bia bib bie bii bim bin bir bma bmb bme bmi bmm bmn bmr bna bnb bne bni bnn bnr bra brb bre bri brm brn brr eaa eab eae eai eam ean ear eba ebb ebe ebi ebm ebn ebr eea eeb eee eem een eer eia eib eie eii eim ein eir em- ema emb eme emi emm emn emr en- ena enb ene eni enm enn enr era erb ere eri erm ern err ia- iaa iab iae iai iam ian iar iba ibb ibe ibi ibm ibn ibr ie- iea iee iei iem ien ier iia iib iie iii iim iin iir im- ima imb ime imi imm imn in- ina inb ine ini inm inn inr ir- ira irb ire iri irm irn irr m-r maa mab mae mai mam man mar mba mbb mbe mbi mbm mbr mea meb mee mei mem men mer mi- mia mib mie mii mim min mir mma mmb mme mmi mmm mmn mmr mna mnb mne mni mnm mnn mnr mra mrb mre mri mrm mrn mrr n-i naa nab nae nai nam nan nar nba nbb nbe nbi nbm nbn nbr ne- nea neb nee nei nem nen ner nia nib nie nii nim nin nir nma nmb nme nmi nmm nmn nmr nna nnb nne nni nnm nnn nra nrb nre nri nrm nrn nrr ra- raa rab rae rai ram ran rar rba rbb rbe rbi rbm rbn rbr re- rea reb ree rei rem ren rer ria rib rie rii rim rin rir rma rmb rme rmi rmm rmn rmr rna rnb rni rnm rnn rnr rra rrb rri rrm rrn rrr