a-a a-b a-c a-t aaa aab aac aad aae aaf aak aan aas aat aau ab- aba abb abc abd abe abf abk abn abs abt abu ac- aca acb acc acd ace acf ack acn acs act acu ad- ada adb adc add ade adf adk adn ads adt adu aea aeb aec aed aee aef aek aen aes aet aeu af- afa afb afc afd afe aff afk afn afs aft afu aka akb akc akd ake akk akn aks aku an- ana anb anc and ane anf ank ann ans ant anu as- asa asb asc asd ase asf ask asn ass ast asu at- ata atb atc atd ate atf atn ats att atu au- aua aub auc aud aue auf auk aun aus aut b-u baa bab bac bad bae baf bak ban bas bat bau bba bbb bbc bbd bbe bbf bbk bbn bbs bbt bbu bca bcb bcc bcd bce bcf bck bcn bcs bct bcu bda bdb bdc bdd bde bdf bdk bds bdt bdu be- bea beb bec bed bee bef bek ben bes bet beu bfa bfb bfc bfd bfe bff bfn bfs bft bfu bka bkb bkc bke bkf bkk bkn bks bkt bna bnb bnc bnd bne bnf bnk bnn bns bnt bnu bsa bsb bsc bsd bse bsf bsk bsn bss bst bsu bta btb btc btd bte btf btk btn bts btt btu bua bub buc bud bue buf buk bun bus but buu c-- caa cab cac cad cae caf cak can cas cat cau cba cbb cbc cbd cbe cbf cbk cbn cbs cbt cbu cca ccb ccc ccd cce ccf cck ccn ccs cct ccu cda cdb cdc cdd cde cdf cdk cdn cds cdt cdu ce- cea ceb cec ced cee cef cek cen ces cet ceu cfa cfb cfc cfd cfe cff cfk cfn cfs cft cfu cka ckb ckc ckd cks ckt cn- cna cnb cnc cnd cne cnf cnn cns cnt cnu csa csb csc csd cse csf csk csn css cst csu cta ctb ctc ctd cte ctf ctk ctn cts ctt ctu cua cub cuc cud cue cuf cuk cun cus cut cuu daa dab dac dad dae daf dak dan das dat dau dba dbb dbc dbd dbe dbf dbk dbn dbs dbt dbu dca dcb dcc dcd dce dcf dck dcn dcs dct dcu dda ddb ddc ddd dde ddf ddk ddn dds ddt ddu de- dea deb dec ded dee def dek den des det deu dfa dfb dfc dfd dfe dff dfk dfn dfs dft dfu dka dkb dkc dke dkk dks dkt dku dna dnb dnc dnd dne dnf dnk dnn dns dnt dsa dsb dsc dsd dse dsf dsk dsn dss dst dsu dta dtb dtc dtd dte dtf dtk dtn dts dtt dtu dua dub duc dud due duf duk dun dus dut eaa eab eac ead eae eaf eak ean eas eat eau eba ebb ebc ebd ebe ebf ebk ebn ebs ebt ebu ec- eca ecb ecc ecd ece ecf eck ecn ecs ect ecu ed- eda edb edc edd ede edf edk edn eds edt edu eea eeb eec eed eee eef eek een ees eet ef- efa efb efc efd efe eff efs eft eka ekb ekc ekd eke ekf eks ekt eku en- ena enb enc end ene enf enk enn ens ent enu es- esa esb esc esd ese esf esk esn ess est esu eta etb etc etd ete etf etk etn ets ett etu eu- eua eub euc eud eue euf eun eus eut faa fab fac fad fae faf fak fan fas fat fau fba fbb fbc fbd fbe fbf fbk fbn fbs fbt fbu fca fcb fcc fcd fce fcf fck fcn fcs fct fcu fda fdb fdc fdd fde fdf fdk fdn fds fdt fdu fea feb fec fed fee fef fek fen fes fet feu ffa ffc ffd ffe fff ffk ffn ffs fft ffu fka fkb fkc fkf fkk fkt fna fnb fnc fnd fne fnf fnk fnn fns fnt fnu fsa fsb fsc fsd fse fsf fsk fsn fss fst fsu fta ftb ftc ftd fte ftf ftk ftn fts ftt ftu fua fub fud fue fuf fuk fun fus fut fuu k-t ka- kaa kab kac kad kae kaf kak kan kas kat kau kba kbb kbc kbd kbe kbf kbk kbn kbs kbu kca kcb kcc kcd kce kck kcn kcs kct kcu kda kdb kdc kde kdf kdk kds kdt kdu ke- kea keb kec ked kee kef kek ken kes ket kfa kfc kfd kff kfs kfu kkb kkc kke kkk kkn kks kkt kku kn- kna knc knd kne knf knk knn knt knu ksa ksb ksc ksd kse ksf ksk ksn kss kst ksu kta ktb ktc kte ktf ktk ktn kts ktt ktu kub kuc kud kue kuk kun kus kut kuu naa nab nac nad nae naf nak nan nas nat nau nba nbb nbc nbd nbe nbf nbk nbn nbs nbt nbu nca ncb ncc ncd nce ncf nck ncn ncs nct ncu nda ndb ndc ndd nde ndf ndk ndn nds ndt ndu ne- nea neb nec ned nee nef nek nen nes net neu nfa nfb nfc nfd nfe nff nfk nfn nfs nft nfu nka nkc nke nkf nkk nkn nks nkt nku nna nnb nnc nne nnf nnk nnn nns nnt nnu nsa nsb nsc nsd nse nsf nsk nsn nss nst nsu nta ntb ntc ntd nte ntf ntk ntn nts ntt ntu nua nub nuc nud nue nuk nun nus nut nuu saa sab sac sad sae saf sak san sas sat sau sba sbb sbc sbd sbe sbf sbk sbn sbs sbt sbu sca scb scc scd sce scf sck scn scs sct scu sda sdb sdc sdd sde sdf sdk sdn sds sdt sdu se- sea seb sec sed see sef sek sen ses set seu sfa sfb sfc