-er a-a a-b a-c aaa aab aac aad aae aak aan aar aas aau ab- aba abb abc abd abe abk abn abr abs abu ac- aca acb acc acd ace ack acn acr acs acu ad- ada adb adc add ade adk adn adr ads adu aea aeb aec aed aee aek aen aer aes aeu aka akb akc akd ake akk akn akr aks aku an- ana anb anc and ane ank ann anr ans anu ar- ara arb arc ard are ark arn arr ars aru as- asa asb asc asd ase ask asn asr ass asu au- aua aub auc aud aue auk aun aur aus b-u baa bab bac bad bae bak ban bar bas bau bba bbb bbc bbd bbe bbk bbn bbr bbs bbu bca bcb bcc bcd bce bck bcn bcr bcs bcu bda bdb bdc bdd bde bdk bdr bds bdu be- bea beb bec bed bee bek ben ber bes beu bka bkb bkc bke bkk bkn bkr bks bna bnb bnc bnd bne bnk bnn bnr bns bnu bra brb brd bre brk brn brr brs bru bsa bsb bsc bsd bse bsk bsn bsr bss bsu bua bub buc bud bue buk bun bur bus buu c-- caa cab cac cad cae cak can car cas cau cba cbb cbc cbd cbe cbk cbn cbr cbs cbu cca ccb ccc ccd cce cck ccn ccr ccs ccu cda cdb cdc cdd cde cdk cdn cdr cds cdu ce- cea ceb cec ced cee cek cen cer ces ceu cka ckb ckc ckd cks cn- cna cnb cnc cnd cne cnn cnr cns cnu cra crb crc crd cre crk crn crr crs cru csa csb csc csd cse csk csn csr css csu cua cub cuc cud cue cuk cun cur cus cuu daa dab dac dad dae dak dan dar das dau dba dbb dbc dbd dbe dbk dbn dbr dbs dbu dca dcb dcc dcd dce dck dcn dcr dcs dcu dda ddb ddc ddd dde ddk ddn ddr dds ddu de- dea deb dec ded dee dek den der des deu dka dkb dkc dke dkk dkr dks dku dna dnb dnc dnd dne dnk dnn dnr dns dra drb drc drd dre drk drn drr drs dru dsa dsb dsc dsd dse dsk dsn dsr dss dsu dua dub duc dud due duk dun dur dus eaa eab eac ead eae eak ean ear eas eau eba ebb ebc ebd ebe ebk ebn ebr ebs ebu ec- eca ecb ecc ecd ece eck ecn ecr ecs ecu ed- eda edb edc edd ede edk edn edr eds edu eea eeb eec eed eee eek een eer ees eka ekb ekc ekd eke ekr eks eku en- ena enb enc end ene enk enn enr ens enu era erb erc erd ere erk ern err ers eru es- esa esb esc esd ese esk esn esr ess esu eu- eua eub euc eud eue eun eur eus ka- kaa kab kac kad kae kak kan kar kas kau kba kbb kbc kbd kbe kbk kbn kbr kbs kbu kca kcb kcc kcd kce kck kcn kcr kcs kcu kda kdb kdc kde kdk kdr kds kdu ke- kea keb kec ked kee kek ken ker kes kkb kkc kke kkk kkn kkr kks kku kn- kna knc knd kne knk knn knr knu kra krc krd krk krn krr krs kru ksa ksb ksc ksd kse ksk ksn ksr kss ksu kub kuc kud kue kuk kun kur kus kuu naa nab nac nad nae nak nan nar nas nau nba nbb nbc nbd nbe nbk nbn nbr nbs nbu nca ncb ncc ncd nce nck ncn ncr ncs ncu nda ndb ndc ndd nde ndk ndn ndr nds ndu ne- nea neb nec ned nee nek nen ner nes neu nka nkc nke nkk nkn nkr nks nku nna nnb nnc nne nnk nnn nns nnu nra nrb nrc nrd nre nrk nrn nrr nrs nru nsa nsb nsc nsd nse nsk nsn nsr nss nsu nua nub nuc nud nue nuk nun nur nus nuu ra- raa rab rac rad rae rak ran rar ras rau rba rbb rbc rbd rbe rbk rbn rbr rbs rbu rca rcb rcc rcd rce rcn rcr rcs rcu rda rdb rdc rdd rde rdn rdr rds rdu re- rea reb rec red ree rek ren rer res reu rkb rkc rke rkk rks rku rna rnb rnc rnd rnn rnr rns rnu rra rrb rrc rrd rrk rrn rrr rrs rru rsa rsb rsc rsd rse rsk rsn rsr rss rsu rua rub ruc rud rue ruk run rur rus ruu saa sab sac sad sae sak san sar sas sau sba sbb sbc sbd sbe sbk sbn sbr sbs sbu sca scb scc scd sce sck scn scr scs scu sda sdb sdc sdd sde sdk sdn sdr sds sdu se- sea seb sec sed see sek sen ser ses seu sk- ska skb skc skd ske skk skr sks sku sna snb snc snd sne snk snn snr sns snu sr- sra srb src srd sre srk srn srr srs ss- ssa ssb ssc ssd sse ssk ssn ssr sss ssu sua sub suc sud sue suk sun sur sus suu ua- uaa uab uac uad uae uak uan uar uas uau uba ubb ubc ube ubk ubn ubr ubs ubu uca ucb ucc ucd uce uck ucn ucr ucs ucu uda udb udc udd ude udk udn udr uds udu uea ueb uec ued uee uen uer ues uka ukb ukc uke ukk ukn ukr uku un- una unb unc und une unk unn unr uns unu ur- ura urb urc urd ure urk urn urr urs uru usa usb usc usd use usk usn usr uss usu uua uuc uue uun uur uus uuu