-er a-a a-b a-c aaa aab aac aae aam aan aao aar aas aau ab- aba abb abc abe abm abn abo abr abs abu ac- aca acb acc ace acm acn aco acr acs acu aea aeb aec aee aem aen aeo aer aes aeu ama amb amc ame amm amn amo amr ams amu an- ana anb anc ane anm ann ano anr ans anu aoa aob aoc aoe aom aon aoo aor aos aou ar- ara arb arc are arm arn aro arr ars aru as- asa asb asc ase asm asn aso asr ass asu au- aua aub auc aue aum aun auo aur aus b-u baa bab bac bae bam ban bao bar bas bau bba bbb bbc bbe bbm bbn bbo bbr bbs bbu bca bcb bcc bce bcm bcn bco bcr bcs bcu be- bea beb bec bee bem ben beo ber bes beu bma bmb bmc bme bmm bmn bmo bmr bms bmu bna bnb bnc bne bnn bno bnr bns bnu boa bob boc boe bom bon boo bor bos bou bra brb bre brm brn bro brr brs bru bsa bsb bsc bse bsm bsn bso bsr bss bsu bua bub buc bue bum bun buo bur bus buu c-- caa cab cac cae cam can cao car cas cau cba cbb cbc cbe cbm cbn cbo cbr cbs cbu cca ccb ccc cce ccm ccn cco ccr ccs ccu ce- cea ceb cec cee cem cen ceo cer ces ceu cma cmb cmc cme cmm cmn cmo cmr cms cmu cn- cna cnb cnc cne cnm cnn cno cnr cns cnu co- coa cob coc coe com con coo cor cos cou cra crb crc cre crm crn cro crr crs cru csa csb csc cse csm csn cso csr css csu cua cub cuc cue cum cun cuo cur cus cuu eaa eab eac eae eam ean eao ear eas eau eba ebb ebc ebe ebm ebn ebo ebr ebs ebu ec- eca ecb ecc ece ecm ecn eco ecr ecs ecu eea eeb eec eee eem een eeo eer ees em- ema emb emc eme emm emn emo emr ems emu en- ena enb enc ene enm enn eno enr ens enu eo- eoa eob eoc eoe eom eon eoo eor eos eou era erb erc ere erm ern ero err ers eru es- esa esb esc ese esm esn eso esr ess esu eu- eua eub euc eue eun eur eus m-o m-r maa mab mac mae mam man mao mar mas mau mba mbb mbc mbe mbm mbo mbr mbs mbu mc- mca mcb mcc mce mcm mcn mco mcr mcs mcu mea meb mec mee mem men meo mer mes meu mma mmb mmc mme mmm mmn mmo mmr mms mmu mna mnb mnc mne mnm mnn mno mnr mns mnu moa mob moc moe mom mon moo mor mos mou mra mrb mrc mre mrm mrn mro mrr mrs mru msa msb msc mse msm msn mso msr mss msu mua mub muc mue mum mun mur mus muu naa nab nac nae nam nan nao nar nas nau nba nbb nbc nbe nbm nbn nbo nbr nbs nbu nca ncb ncc nce ncm ncn nco ncr ncs ncu ne- nea neb nec nee nem nen neo ner nes neu nma nmb nmc nme nmm nmn nmo nmr nms nmu nna nnb nnc nne nnm nnn nno nns nnu no- noa nob noc noe nom non noo nor nos nou nra nrb nrc nre nrm nrn nro nrr nrs nru nsa nsb nsc nse nsm nsn nso nsr nss nsu nua nub nuc nue num nun nuo nur nus nuu oaa oab oac oae oam oan oao oar oas oau ob- oba obb obc obe obm obn obo obr obs obu oc- oca ocb occ ocm ocn oco ocr ocs ocu oea oeb oec oee oem oen oeo oer oes om- oma omb omc ome omm omn omo omr oms omu on- ona onb onc one onn ono onr ons onu oo- ooa oob ooc oom oon ooo oor oos or- ora orb orc ore orm orn oro orr ors oru os- osa osb osc ose osm osn oso osr oss osu ou- oua ouc oue oum oun ouo our ous ra- raa rab rac rae ram ran rao rar ras rau rba rbb rbc rbe rbm rbn rbo rbr rbs rbu rca rcb rcc rce rcm rcn rco rcr rcs rcu re- rea reb rec ree rem ren reo rer res reu rma rmb rmc rme rmm rmn rmo rmr rms rna rnb rnc rnm rnn rno rnr rns rnu roa rob roc roe rom ron roo ror ros rou rra rrb rrc rrm rrn rrr rrs rru rsa rsb rsc rse rsm rsn rso rsr rss rsu rua rub ruc rue rum run ruo rur rus ruu saa sab sac sae sam san sao sar sas sau sba sbb sbc sbe sbm sbn sbo sbr sbs sbu sca scb scc sce scm scn sco scr scs scu se- sea seb sec see sem sen seo ser ses seu sma smb smc sme smm smn smo smr sms smu sna snb snc sne snm snn sno snr sns snu soa sob soc soe som son soo sor sos sou sr- sra srb src sre srm srn sro srr srs ss- ssa ssb ssc sse ssm ssn sso ssr sss ssu sua sub suc sue sum sun suo sur sus suu ua- uaa uab uac uae uam uan uao uar uas uau uba ubb ubc ube ubn ubo ubr ubs ubu uca ucb ucc uce ucm ucn uco ucr ucs ucu uea ueb uec uee uem uen uer ues um- uma umb umc ume umm umn umo umr ums umu un- una unb unc une unm unn uno unr uns unu uoa uob uoc uoe uom uon uoo uor uos ur- ura urb urc ure urm urn uro urr urs uru usa usb