-er a-a a-b a-i aaa aab aae aai aan aao aar aau ab- aba abb abe abi abn abo abr abu aea aeb aee aei aen aeo aer aeu ai- aia aib aie aii ain aio air aiu an- ana anb ane ani ann ano anr anu aoa aob aoe aoi aon aoo aor aou ar- ara arb are ari arn aro arr aru au- aua aub aue aui aun auo aur b-u baa bab bae bai ban bao bar bau bba bbb bbe bbi bbn bbo bbr bbu be- bea beb bee bei ben beo ber beu bi- bia bib bie bii bin bio bir biu bna bnb bne bni bnn bno bnr bnu boa bob boe boi bon boo bor bou bra brb bre bri brn bro brr bru bua bub bue bui bun buo bur buu eaa eab eae eai ean eao ear eau eba ebb ebe ebi ebn ebo ebr ebu eea eeb eee een eeo eer eia eib eie eii ein eio eir eiu en- ena enb ene eni enn eno enr enu eo- eoa eob eoe eoi eon eoo eor eou era erb ere eri ern ero err eru eu- eua eub eue eui eun eur ia- iaa iab iae iai ian iao iar iau iba ibb ibe ibi ibn ibo ibr ibu ie- iea iee iei ien ier iia iib iie iii iin iio iir iiu in- ina inb ine ini inn ino inr inu io- ioa iob ioe ioi ion ioo ior iou ir- ira irb ire iri irn iro irr iru iu- iua iub iue iui iur n-i naa nab nae nai nan nao nar nau nba nbb nbe nbi nbn nbo nbr nbu ne- nea neb nee nei nen neo ner neu nia nib nie nii nin nio nir niu nna nnb nne nni nnn nno nnu no- noa nob noe noi non noo nor nou nra nrb nre nri nrn nro nrr nru nua nub nue nui nun nuo nur nuu o-i oaa oab oae oai oan oao oar oau ob- oba obb obe obi obn obo obr obu oea oeb oee oei oen oeo oer oia oib oie oii oin oio oir oiu on- ona onb one oni onn ono onr onu oo- ooa oob ooi oon ooo oor or- ora orb ore ori orn oro orr oru ou- oua oue oui oun ouo our ra- raa rab rae rai ran rao rar rau rba rbb rbe rbi rbn rbo rbr rbu re- rea reb ree rei ren reo rer reu ria rib rie rii rin rio rir rna rnb rni rnn rno rnr rnu roa rob roe roi ron roo ror rou rra rrb rri rrn rrr rru rua rub rue rui run ruo rur ruu ua- uaa uab uae uai uan uao uar uau uba ubb ube ubi ubn ubo ubr ubu uea ueb uee uei uen uer uia uib uie uii uin uio uir uiu un- una unb une uni unn uno unr unu uoa uob uoe uon uoo uor ur- ura urb ure uri urn uro urr uru uua uue uun uur uuu