-er a-a a-b a-i aaa aab aae aai aan aar aau ab- aba abb abe abi abn abr abu aea aeb aee aei aen aer aeu ai- aia aib aie aii ain air aiu an- ana anb ane ani ann anr anu ar- ara arb are ari arn arr aru au- aua aub aue aui aun aur b-u baa bab bae bai ban bar bau bba bbb bbe bbi bbn bbr bbu be- bea beb bee bei ben ber beu bi- bia bib bie bii bin bir biu bna bnb bne bni bnn bnr bnu bra brb bre bri brn brr bru bua bub bue bui bun bur buu eaa eab eae eai ean ear eau eba ebb ebe ebi ebn ebr ebu eea eeb eee een eer eia eib eie eii ein eir eiu en- ena enb ene eni enn enr enu era erb ere eri ern err eru eu- eua eub eue eui eun eur ia- iaa iab iae iai ian iar iau iba ibb ibe ibi ibn ibr ibu ie- iea iee iei ien ier iia iib iie iii iin iir iiu in- ina inb ine ini inn inr inu ir- ira irb ire iri irn irr iru iu- iua iub iue iui iur n-i naa nab nae nai nan nar nau nba nbb nbe nbi nbn nbr nbu ne- nea neb nee nei nen ner neu nia nib nie nii nin nir niu nna nnb nne nni nnn nnu nra nrb nre nri nrn nrr nru nua nub nue nui nun nur nuu ra- raa rab rae rai ran rar rau rba rbb rbe rbi rbn rbr rbu re- rea reb ree rei ren rer reu ria rib rie rii rin rir rna rnb rni rnn rnr rnu rra rrb rri rrn rrr rru rua rub rue rui run rur ruu ua- uaa uab uae uai uan uar uau uba ubb ube ubi ubn ubr ubu uea ueb uee uei uen uer uia uib uie uii uin uir uiu un- una unb une uni unn unr unu ur- ura urb ure uri urn urr uru uua uue uun uur uuu