-er a-a a-b a-i aaa aab aad aae aai aak aao aar aas aau ab- aba abb abd abe abi abk abo abr abs abu ad- ada adb add ade adi adk ado adr ads adu aea aeb aed aee aei aek aeo aer aes aeu ai- aia aib aid aie aii aik aio air ais aiu aka akb akd ake aki akk ako akr aks aku aoa aob aod aoe aoi aok aoo aor aos aou ar- ara arb ard are ari ark aro arr ars aru as- asa asb asd ase asi ask aso asr ass asu au- aua aub aud aue aui auk auo aur aus b-u baa bab bad bae bai bak bao bar bas bau bba bbb bbd bbe bbi bbk bbo bbr bbs bbu bda bdb bdd bde bdi bdk bdo bdr bds bdu be- bea beb bed bee bei bek beo ber bes beu bi- bia bib bid bie bii bik bio bir bis biu bka bkb bke bkk bko bkr bks boa bob bod boe boi bok boo bor bos bou bra brb brd bre bri brk bro brr brs bru bsa bsb bsd bse bsi bsk bso bsr bss bsu bua bub bud bue bui buk buo bur bus buu daa dab dad dae dai dak dao dar das dau dba dbb dbd dbe dbi dbk dbo dbr dbs dbu dda ddb ddd dde ddi ddk ddo ddr dds ddu de- dea deb ded dee dei dek deo der des deu di- dia dib did die dii dik dio dir dis diu dka dkb dke dki dkk dko dkr dks dku doa dob dod doe doi dok doo dor dos dou dra drb drd dre dri drk dro drr drs dru dsa dsb dsd dse dsi dsk dso dsr dss dsu dua dub dud due dui duk duo dur dus eaa eab ead eae eai eak eao ear eas eau eba ebb ebd ebe ebi ebk ebo ebr ebs ebu ed- eda edb edd ede edi edk edo edr eds edu eea eeb eed eee eek eeo eer ees eia eib eid eie eii eik eio eir eis eiu eka ekb ekd eke eki eko ekr eks eku eo- eoa eob eod eoe eoi eok eoo eor eos eou era erb erd ere eri erk ero err ers eru es- esa esb esd ese esi esk eso esr ess esu eu- eua eub eud eue eui eur eus i-d ia- iaa iab iad iae iai iao iar ias iau iba ibb ibd ibe ibi ibk ibo ibr ibs ibu ida idb idd ide idi idk ido idr ids idu ie- iea ied iee iei iek ier ies iia iib iid iie iii iio iir iis iiu ika ikb ike iki ikk iko ikr iks iku io- ioa iob iod ioe ioi ioo ior ios iou ir- ira irb ird ire iri irk iro irr irs iru is- isa isb isd ise isi isk iso isr iss isu iu- iua iub iud iue iui iur ius ka- kaa kab kad kae kai kak kao kar kas kau kba kbb kbd kbe kbi kbk kbo kbr kbs kbu kda kdb kde kdk kdo kdr kds kdu ke- kea keb ked kee kei kek keo ker kes kia kib kid kie kii kik kio kir kis kiu kkb kke kki kkk kkr kks kku koa kob kod koe koi kok koo kor kos kou kra krd kri krk kro krr krs kru ksa ksb ksd kse ksi ksk kso ksr kss ksu kub kud kue kui kuk kur kus kuu o-i oaa oab oad oae oai oak oao oar oas oau ob- oba obb obd obe obi obk obo obr obs obu oda odb odd ode odi odo odr ods odu oea oeb oed oee oei oeo oer oes oia oib oid oie oii oik oio oir ois oiu oka okb okd oke oki okk oko okr oks oku oo- ooa oob ood ooi ook ooo oor oos or- ora orb ord ore ori ork oro orr ors oru os- osa osb osd ose osi osk oso osr oss osu ou- oua oud oue oui ouk ouo our ous ra- raa rab rad rae rai rak rao rar ras rau rba rbb rbd rbe rbi rbk rbo rbr rbs rbu rda rdb rdd rde rdi rdo rdr rds rdu re- rea reb red ree rei rek reo rer res reu ria rib rid rie rii rik rio rir ris rkb rke rkk rko rks rku roa rob rod roe roi rok roo ror ros rou rra rrb rrd rri rrk rrr rrs rru rsa rsb rsd rse rsi rsk rso rsr rss rsu rua rub rud rue rui ruk ruo rur rus ruu saa sab sad sae sai sak sao sar sas sau sba sbb sbd sbe sbi sbk sbo sbr sbs sbu sda sdb sdd sde sdi sdk sdo sdr sds sdu se- sea seb sed see sei sek seo ser ses seu sia sib sid sie sii sik sio sir sis siu sk- ska skb skd ske ski skk sko skr sks sku soa sob sod soe soi sok soo sor sos sou sr- sra srb srd sre sri srk sro srr srs ss- ssa ssb ssd sse ssi ssk sso ssr sss ssu sua sub sud sue sui suk suo sur sus suu ua- uaa uab uad uae uai uak uao uar uas uau uba ubb ube ubi ubk ubo ubr ubs ubu uda udb udd ude udi udk udo udr uds udu uea ueb ued uee uei uer ues uia uib uid uie uii uio uir uis uiu uka ukb uke uki ukk ukr uku uoa uob uod uoe uok uoo uor uos ur- ura urb urd ure uri urk uro urr urs uru usa usb usd use usi usk uso usr uss usu uua uue uur uus uuu