-er a-a a-b a-i aaa aab aae aai aak aan aao aar aau ab- aba abb abe abi abk abn abo abr abu aea aeb aee aei aek aen aeo aer aeu ai- aia aib aie aii aik ain aio air aiu aka akb ake aki akk akn ako akr aku an- ana anb ane ani ank ann ano anr anu aoa aob aoe aoi aok aon aoo aor aou ar- ara arb are ari ark arn aro arr aru au- aua aub aue aui auk aun auo aur b-u baa bab bae bai bak ban bao bar bau bba bbb bbe bbi bbk bbn bbo bbr bbu be- bea beb bee bei bek ben beo ber beu bi- bia bib bie bii bik bin bio bir biu bka bkb bke bkk bkn bko bkr bna bnb bne bni bnk bnn bno bnr bnu boa bob boe boi bok bon boo bor bou bra brb bre bri brk brn bro brr bru bua bub bue bui buk bun buo bur buu eaa eab eae eai eak ean eao ear eau eba ebb ebe ebi ebk ebn ebo ebr ebu eea eeb eee eek een eeo eer eia eib eie eii eik ein eio eir eiu eka ekb eke eki eko ekr eku en- ena enb ene eni enk enn eno enr enu eo- eoa eob eoe eoi eok eon eoo eor eou era erb ere eri erk ern ero err eru eu- eua eub eue eui eun eur ia- iaa iab iae iai ian iao iar iau iba ibb ibe ibi ibk ibn ibo ibr ibu ie- iea iee iei iek ien ier iia iib iie iii iin iio iir iiu ika ikb ike iki ikk iko ikr iku in- ina inb ine ini ink inn ino inr inu io- ioa iob ioe ioi ion ioo ior iou ir- ira irb ire iri irk irn iro irr iru iu- iua iub iue iui iur ka- kaa kab kae kai kak kan kao kar kau kba kbb kbe kbi kbk kbn kbo kbr kbu ke- kea keb kee kei kek ken keo ker kia kib kie kii kik kin kio kir kiu kkb kke kki kkk kkn kkr kku kn- kna kne kni knk knn kno knr knu koa kob koe koi kok kon koo kor kou kra kri krk krn kro krr kru kub kue kui kuk kun kur kuu n-i naa nab nae nai nak nan nao nar nau nba nbb nbe nbi nbk nbn nbo nbr nbu ne- nea neb nee nei nek nen neo ner neu nia nib nie nii nik nin nio nir niu nka nke nki nkk nkn nko nkr nku nna nnb nne nni nnk nnn nno nnu no- noa nob noe noi nok non noo nor nou nra nrb nre nri nrk nrn nro nrr nru nua nub nue nui nuk nun nuo nur nuu o-i oaa oab oae oai oak oan oao oar oau ob- oba obb obe obi obk obn obo obr obu oea oeb oee oei oen oeo oer oia oib oie oii oik oin oio oir oiu oka okb oke oki okk oko okr oku on- ona onb one oni onk onn ono onr onu oo- ooa oob ooi ook oon ooo oor or- ora orb ore ori ork orn oro orr oru ou- oua oue oui ouk oun ouo our ra- raa rab rae rai rak ran rao rar rau rba rbb rbe rbi rbk rbn rbo rbr rbu re- rea reb ree rei rek ren reo rer reu ria rib rie rii rik rin rio rir rkb rke rkk rko rku rna rnb rni rnn rno rnr rnu roa rob roe roi rok ron roo ror rou rra rrb rri rrk rrn rrr rru rua rub rue rui ruk run ruo rur ruu ua- uaa uab uae uai uak uan uao uar uau uba ubb ube ubi ubk ubn ubo ubr ubu uea ueb uee uei uen uer uia uib uie uii uin uio uir uiu uka ukb uke uki ukk ukn ukr uku un- una unb une uni unk unn uno unr unu uoa uob uoe uok uon uoo uor ur- ura urb ure uri urk urn uro urr uru uua uue uun uur uuu