-er a-a a-b a-c aaa aab aac aae aag aak aan aao aar aas aau ab- aba abb abc abe abg abk abn abo abr abs abu ac- aca acb acc ace acg ack acn aco acr acs acu aea aeb aec aee aeg aek aen aeo aer aes aeu ag- aga agb agc age agg agk agn ago agr ags agu aka akb akc ake akg akk akn ako akr aks aku an- ana anb anc ane ang ank ann ano anr ans anu aoa aob aoc aoe aog aok aon aoo aor aos aou ar- ara arb arc are arg ark arn aro arr ars aru as- asa asb asc ase asg ask asn aso asr ass asu au- aua aub auc aue aug auk aun auo aur aus b-u baa bab bac bae bag bak ban bao bar bas bau bba bbb bbc bbe bbg bbk bbn bbo bbr bbs bbu bca bcb bcc bce bcg bck bcn bco bcr bcs bcu be- bea beb bec bee beg bek ben beo ber bes beu bga bgb bgc bge bgg bgk bgn bgo bgr bgs bgu bka bkb bkc bke bkg bkk bkn bko bkr bks bna bnb bnc bne bng bnk bnn bno bnr bns bnu boa bob boc boe bog bok bon boo bor bos bou bra brb bre brg brk brn bro brr brs bru bsa bsb bsc bse bsg bsk bsn bso bsr bss bsu bua bub buc bue bug buk bun buo bur bus buu c-- caa cab cac cae cag cak can cao car cas cau cba cbb cbc cbe cbg cbk cbn cbo cbr cbs cbu cca ccb ccc cce ccg cck ccn cco ccr ccs ccu ce- cea ceb cec cee ceg cek cen ceo cer ces ceu cga cgb cgc cge cgg cgn cgo cgr cgs cgu cka ckb ckc cko cks cn- cna cnb cnc cne cng cnn cno cnr cns cnu co- coa cob coc coe cog cok con coo cor cos cou cra crb crc cre crg crk crn cro crr crs cru csa csb csc cse csg csk csn cso csr css csu cua cub cuc cue cug cuk cun cuo cur cus cuu eaa eab eac eae eag eak ean eao ear eas eau eba ebb ebc ebe ebg ebk ebn ebo ebr ebs ebu ec- eca ecb ecc ece ecg eck ecn eco ecr ecs ecu eea eeb eec eee eeg eek een eeo eer ees ega egb egc ege egg egn ego egr egs egu eka ekb ekc eke ekg eko ekr eks eku en- ena enb enc ene eng enk enn eno enr ens enu eo- eoa eob eoc eoe eog eok eon eoo eor eos eou era erb erc ere erg erk ern ero err ers eru es- esa esb esc ese esg esk esn eso esr ess esu eu- eua eub euc eue eug eun eur eus gaa gab gac gae gag gak gan gao gar gas gau gba gbc gbe gbg gbk gbn gbo gbr gbs gbu gca gcb gcc gce gcg gck gcn gco gcr gcs gcu ge- gea geb gec gee geg gek gen geo ger ges geu gga ggb ggc ggg ggn ggo ggr ggs ggu gka gkb gkn gko gks gna gnb gnc gne gnn gno gnr gns gnu goa gob goc goe gog gok gon goo gor gos gou gra grb grc gre grg grk grn gro grr grs gru gsa gsb gsc gse gsg gsk gsn gso gsr gss gsu gu- gua gub guc gue gug guk gun guo gur gus guu ka- kaa kab kac kae kag kak kan kao kar kas kau kba kbb kbc kbe kbk kbn kbo kbr kbs kbu kca kcb kcc kce kcg kck kcn kcr kcs kcu ke- kea keb kec kee keg kek ken keo ker kes kga kgb kgc kgo kgs kgu kkb kkc kke kkk kkn kkr kks kku kn- kna knc kne kng knk knn kno knr knu koa kob koc koe kog kok kon koo kor kos kou kra krc krg krk krn kro krr krs kru ksa ksb ksc kse ksg ksk ksn kso ksr kss ksu kub kuc kue kug kuk kun kur kus kuu naa nab nac nae nag nak nan nao nar nas nau nba nbb nbc nbe nbg nbk nbn nbo nbr nbs nbu nca ncb ncc nce ncg nck ncn nco ncr ncs ncu ne- nea neb nec nee neg nek nen neo ner nes neu nga ngb ngc nge ngg ngk ngn ngo ngs ngu nka nkc nke nkk nkn nko nkr nks nku nna nnb nnc nne nng nnk nnn nno nns nnu no- noa nob noc noe nog nok non noo nor nos nou nra nrb nrc nre nrg nrk nrn nro nrr nrs nru nsa nsb nsc nse nsg nsk nsn nso nsr nss nsu nua nub nuc nue nug nuk nun nuo nur nus nuu oaa oab oac oae oag oak oan oao oar oas oau ob- oba obb obc obe obg obk obn obo obr obs obu oc- oca ocb occ ocg ock ocn oco ocr ocs ocu oea oeb oec oee oeg oen oeo oer oes oga ogc oge ogg ogn ogo ogs oka okb okc oke okg okk oko okr oks oku on- ona onb onc one ong onk onn ono onr ons onu oo- ooa oob ooc oog ook oon ooo oor oos or- ora orb orc ore org ork orn oro orr ors oru os- osa osb osc ose osg osk osn oso osr oss osu ou- oua ouc oue ouk oun ouo our ous ra- raa rab rac rae rag rak ran rao rar ras rau rba rbb rbc rbe rbg rbk rbn rbo rbr rbs rbu rca rcb rcc rce rcg rcn rco rcr rcs rcu re- rea reb rec ree reg rek ren reo rer res reu rga rgb rgc rge rgg rgk rgn rgo rgr rgs rkb rkc rke rkg