-er a-a a-b a-c aaa aab aac aad aae aaf aak aan aao aar aas aau ab- aba abb abc abd abe abf abk abn abo abr abs abu ac- aca acb acc acd ace acf ack acn aco acr acs acu ad- ada adb adc add ade adf adk adn ado adr ads adu aea aeb aec aed aee aef aek aen aeo aer aes aeu af- afa afb afc afd afe aff afk afn afo afr afs afu aka akb akc akd ake akk akn ako akr aks aku an- ana anb anc and ane anf ank ann ano anr ans anu aoa aob aoc aod aoe aof aok aon aoo aor aos aou ar- ara arb arc ard are arf ark arn aro arr ars aru as- asa asb asc asd ase asf ask asn aso asr ass asu au- aua aub auc aud aue auf auk aun auo aur aus b-u baa bab bac bad bae baf bak ban bao bar bas bau bba bbb bbc bbd bbe bbf bbk bbn bbo bbr bbs bbu bca bcb bcc bcd bce bcf bck bcn bco bcr bcs bcu bda bdb bdc bdd bde bdf bdk bdo bdr bds bdu be- bea beb bec bed bee bef bek ben beo ber bes beu bfa bfb bfc bfd bfe bff bfn bfo bfr bfs bfu bka bkb bkc bke bkf bkk bkn bko bkr bks bna bnb bnc bnd bne bnf bnk bnn bno bnr bns bnu boa bob boc bod boe bof bok bon boo bor bos bou bra brb brd bre brf brk brn bro brr brs bru bsa bsb bsc bsd bse bsf bsk bsn bso bsr bss bsu bua bub buc bud bue buf buk bun buo bur bus buu c-- caa cab cac cad cae caf cak can cao car cas cau cba cbb cbc cbd cbe cbf cbk cbn cbo cbr cbs cbu cca ccb ccc ccd cce ccf cck ccn cco ccr ccs ccu cda cdb cdc cdd cde cdf cdk cdn cdo cdr cds cdu ce- cea ceb cec ced cee cef cek cen ceo cer ces ceu cfa cfb cfc cfd cfe cff cfk cfn cfo cfr cfs cfu cka ckb ckc ckd cko cks cn- cna cnb cnc cnd cne cnf cnn cno cnr cns cnu co- coa cob coc cod coe cof cok con coo cor cos cou cra crb crc crd cre crf crk crn cro crr crs cru csa csb csc csd cse csf csk csn cso csr css csu cua cub cuc cud cue cuf cuk cun cuo cur cus cuu daa dab dac dad dae daf dak dan dao dar das dau dba dbb dbc dbd dbe dbf dbk dbn dbo dbr dbs dbu dca dcb dcc dcd dce dcf dck dcn dco dcr dcs dcu dda ddb ddc ddd dde ddf ddk ddn ddo ddr dds ddu de- dea deb dec ded dee def dek den deo der des deu dfa dfb dfc dfd dfe dff dfk dfn dfo dfr dfs dfu dka dkb dkc dke dkk dko dkr dks dku dna dnb dnc dnd dne dnf dnk dnn dno dnr dns doa dob doc dod doe dof dok don doo dor dos dou dra drb drc drd dre drk drn dro drr drs dru dsa dsb dsc dsd dse dsf dsk dsn dso dsr dss dsu dua dub duc dud due duf duk dun duo dur dus eaa eab eac ead eae eaf eak ean eao ear eas eau eba ebb ebc ebd ebe ebf ebk ebn ebo ebr ebs ebu ec- eca ecb ecc ecd ece ecf eck ecn eco ecr ecs ecu ed- eda edb edc edd ede edf edk edn edo edr eds edu eea eeb eec eed eee eef eek een eeo eer ees ef- efa efb efc efd efe eff efo efr efs eka ekb ekc ekd eke ekf eko ekr eks eku en- ena enb enc end ene enf enk enn eno enr ens enu eo- eoa eob eoc eod eoe eof eok eon eoo eor eos eou era erb erc erd ere erf erk ern ero err ers eru es- esa esb esc esd ese esf esk esn eso esr ess esu eu- eua eub euc eud eue euf eun eur eus faa fab fac fad fae faf fak fan fao far fas fau fba fbb fbc fbd fbe fbf fbk fbn fbo fbr fbs fbu fca fcb fcc fcd fce fcf fck fcn fco fcr fcs fcu fda fdb fdc fdd fde fdf fdk fdn fdo fdr fds fdu fea feb fec fed fee fef fek fen feo fer fes feu ffa ffc ffd ffe fff ffk ffn ffo ffr ffs ffu fka fkb fkc fkf fkk fna fnb fnc fnd fne fnf fnk fnn fnr fns fnu foa fob foc foe fof fok fon foo for fos fou fra frb frc frd fre frf frk frn fro frr frs fru fsa fsb fsc fsd fse fsf fsk fsn fso fsr fss fsu fua fub fud fue fuf fuk fun fuo fur fus fuu ka- kaa kab kac kad kae kaf kak kan kao kar kas kau kba kbb kbc kbd kbe kbf kbk kbn kbo kbr kbs kbu kca kcb kcc kcd kce kck kcn kcr kcs kcu kda kdb kdc kde kdf kdk kdo kdr kds kdu ke- kea keb kec ked kee kef kek ken keo ker kes kfa kfc kfd kff kfo kfs kfu kkb kkc kke kkk kkn kkr kks kku kn- kna knc knd kne knf knk knn kno knr knu koa kob koc kod koe kof kok kon koo kor kos kou kra krc krd krf krk krn kro krr krs kru ksa ksb ksc ksd kse ksf ksk ksn kso ksr kss ksu kub kuc kud kue kuk kun kur kus kuu naa nab nac nad nae naf nak nan nao nar nas nau nba nbb nbc nbd nbe nbf nbk nbn nbo nbr nbs nbu