a-a a-b a-i aaa aab aai aan aar aau ab- aba abb abi abn abr abu ai- aia aib aii ain air aiu an- ana anb ani ann anr anu ar- ara arb ari arn arr aru au- aua aub aui aun aur b-u baa bab bai ban bar bau bba bbb bbi bbn bbr bbu bi- bia bib bii bin bir biu bna bnb bni bnn bnr bnu bra brb bri brn brr bru bua bub bui bun bur buu ia- iaa iab iai ian iar iau iba ibb ibi ibn ibr ibu iia iib iii iin iir iiu in- ina inb ini inn inr inu ir- ira irb iri irn irr iru iu- iua iub iui iur n-i naa nab nai nan nar nau nba nbb nbi nbn nbr nbu nia nib nii nin nir niu nna nnb nni nnn nnu nra nrb nri nrn nrr nru nua nub nui nun nur nuu ra- raa rab rai ran rar rau rba rbb rbi rbn rbr rbu ria rib rii rin rir rna rnb rni rnn rnr rnu rra rrb rri rrn rrr rru rua rub rui run rur ruu ua- uaa uab uai uan uar uau uba ubb ubi ubn ubr ubu uia uib uii uin uir uiu un- una unb uni unn unr unu ur- ura urb uri urn urr uru uua uun uur uuu