-er a-a a-b a-i aaa aab aae aai aak aao aar aau ab- aba abb abe abi abk abo abr abu aea aeb aee aei aek aeo aer aeu ai- aia aib aie aii aik aio air aiu aka akb ake aki akk ako akr aku aoa aob aoe aoi aok aoo aor aou ar- ara arb are ari ark aro arr aru au- aua aub aue aui auk auo aur b-u baa bab bae bai bak bao bar bau bba bbb bbe bbi bbk bbo bbr bbu be- bea beb bee bei bek beo ber beu bi- bia bib bie bii bik bio bir biu bka bkb bke bkk bko bkr boa bob boe boi bok boo bor bou bra brb bre bri brk bro brr bru bua bub bue bui buk buo bur buu eaa eab eae eai eak eao ear eau eba ebb ebe ebi ebk ebo ebr ebu eea eeb eee eek eeo eer eia eib eie eii eik eio eir eiu eka ekb eke eki eko ekr eku eo- eoa eob eoe eoi eok eoo eor eou era erb ere eri erk ero err eru eu- eua eub eue eui eur ia- iaa iab iae iai iao iar iau iba ibb ibe ibi ibk ibo ibr ibu ie- iea iee iei iek ier iia iib iie iii iio iir iiu ika ikb ike iki ikk iko ikr iku io- ioa iob ioe ioi ioo ior iou ir- ira irb ire iri irk iro irr iru iu- iua iub iue iui iur ka- kaa kab kae kai kak kao kar kau kba kbb kbe kbi kbk kbo kbr kbu ke- kea keb kee kei kek keo ker kia kib kie kii kik kio kir kiu kkb kke kki kkk kkr kku koa kob koe koi kok koo kor kou kra kri krk kro krr kru kub kue kui kuk kur kuu o-i oaa oab oae oai oak oao oar oau ob- oba obb obe obi obk obo obr obu oea oeb oee oei oeo oer oia oib oie oii oik oio oir oiu oka okb oke oki okk oko okr oku oo- ooa oob ooi ook ooo oor or- ora orb ore ori ork oro orr oru ou- oua oue oui ouk ouo our ra- raa rab rae rai rak rao rar rau rba rbb rbe rbi rbk rbo rbr rbu re- rea reb ree rei rek reo rer reu ria rib rie rii rik rio rir rkb rke rkk rko rku roa rob roe roi rok roo ror rou rra rrb rri rrk rrr rru rua rub rue rui ruk ruo rur ruu ua- uaa uab uae uai uak uao uar uau uba ubb ube ubi ubk ubo ubr ubu uea ueb uee uei uer uia uib uie uii uio uir uiu uka ukb uke uki ukk ukr uku uoa uob uoe uok uoo uor ur- ura urb ure uri urk uro urr uru uua uue uur uuu