-er a-a a-b a-i a-t aaa aab aae aai aak aao aar aat aau ab- aba abb abe abi abk abo abr abt abu aea aeb aee aei aek aeo aer aet aeu ai- aia aib aie aii aik aio air ait aiu aka akb ake aki akk ako akr aku aoa aob aoe aoi aok aoo aor aot aou ar- ara arb are ari ark aro arr art aru at- ata atb ate ati ato atr att atu au- aua aub aue aui auk auo aur aut b-u baa bab bae bai bak bao bar bat bau bba bbb bbe bbi bbk bbo bbr bbt bbu be- bea beb bee bei bek beo ber bet beu bi- bia bib bie bii bik bio bir bit biu bka bkb bke bkk bko bkr bkt boa bob boe boi bok boo bor bot bou bra brb bre bri brk bro brr brt bru bta btb bte bti btk bto btr btt btu bua bub bue bui buk buo bur but buu eaa eab eae eai eak eao ear eat eau eba ebb ebe ebi ebk ebo ebr ebt ebu eea eeb eee eek eeo eer eet eia eib eie eii eik eio eir eit eiu eka ekb eke eki eko ekr ekt eku eo- eoa eob eoe eoi eok eoo eor eot eou era erb ere eri erk ero err ert eru eta etb ete eti etk eto etr ett etu eu- eua eub eue eui eur eut ia- iaa iab iae iai iao iar iat iau iba ibb ibe ibi ibk ibo ibr ibt ibu ie- iea iee iei iek ier iet iia iib iie iii iio iir iit iiu ika ikb ike iki ikk iko ikr ikt iku io- ioa iob ioe ioi ioo ior iot iou ir- ira irb ire iri irk iro irr irt iru ita itb ite iti itk ito itt itu iu- iua iub iue iui iur iut k-t ka- kaa kab kae kai kak kao kar kat kau kba kbb kbe kbi kbk kbo kbr kbu ke- kea keb kee kei kek keo ker ket kia kib kie kii kik kio kir kit kiu kkb kke kki kkk kkr kkt kku koa kob koe koi kok koo kor kot kou kra kri krk kro krr krt kru kta ktb kte ktk kto ktr ktt ktu kub kue kui kuk kur kut kuu o-i oaa oab oae oai oak oao oar oat oau ob- oba obb obe obi obk obo obr obt obu oea oeb oee oei oeo oer oet oia oib oie oii oik oio oir oit oiu oka okb oke oki okk oko okr oku oo- ooa oob ooi ook ooo oor oot or- ora orb ore ori ork oro orr ort oru ot- ota otb ote oti otk oto otr ott otu ou- oua oue oui ouk ouo our out ra- raa rab rae rai rak rao rar rat rau rba rbb rbe rbi rbk rbo rbr rbt rbu re- rea reb ree rei rek reo rer ret reu ria rib rie rii rik rio rir rit rkb rke rkk rko rkt rku roa rob roe roi rok roo ror rot rou rra rrb rri rrk rrr rrt rru rta rtb rte rti rtk rto rtr rtt rtu rua rub rue rui ruk ruo rur rut ruu taa tab tae tai tak tao tar tat tau tba tbb tbe tbi tbk tbo tbr tbt tbu te- tea teb tee tei tek teo ter tet teu tia tib tie tii tik tio tir tit tiu tka tkb tke tkk tko tkr tkt to- toa tob toe toi tok too tor tot tou tra trb tre tri trk tro trr trt tru tta ttb tte tti ttk tto ttr ttt ttu tua tub tue tui tuk tuo tur tut tuu ua- uaa uab uae uai uak uao uar uat uau uba ubb ube ubi ubk ubo ubr ubt ubu uea ueb uee uei uer uet uia uib uie uii uio uir uit uiu uka ukb uke uki ukk ukr uku uoa uob uoe uok uoo uor uot ur- ura urb ure uri urk uro urr urt uru uta utb ute uti utk uto utr utt utu uua uue uur uut uuu