a-a a-b a-c a-t aaa aab aac aad aae aan aas aat aau ab- aba abb abc abd abe abn abs abt abu ac- aca acb acc acd ace acn acs act acu ad- ada adb adc add ade adn ads adt adu aea aeb aec aed aee aen aes aet aeu an- ana anb anc and ane ann ans ant anu as- asa asb asc asd ase asn ass ast asu at- ata atb atc atd ate atn ats att atu au- aua aub auc aud aue aun aus aut b-u baa bab bac bad bae ban bas bat bau bba bbb bbc bbd bbe bbn bbs bbt bbu bca bcb bcc bcd bce bcn bcs bct bcu bda bdb bdc bdd bde bds bdt bdu be- bea beb bec bed bee ben bes bet beu bna bnb bnc bnd bne bnn bns bnt bnu bsa bsb bsc bsd bse bsn bss bst bsu bta btb btc btd bte btn bts btt btu bua bub buc bud bue bun bus but buu c-- caa cab cac cad cae can cas cat cau cba cbb cbc cbd cbe cbn cbs cbt cbu cca ccb ccc ccd cce ccn ccs cct ccu cda cdb cdc cdd cde cdn cds cdt cdu ce- cea ceb cec ced cee cen ces cet ceu cn- cna cnb cnc cnd cne cnn cns cnt cnu csa csb csc csd cse csn css cst csu cta ctb ctc ctd cte ctn cts ctt ctu cua cub cuc cud cue cun cus cut cuu daa dab dac dad dae dan das dat dau dba dbb dbc dbd dbe dbn dbs dbt dbu dca dcb dcc dcd dce dcn dcs dct dcu dda ddb ddc ddd dde ddn dds ddt ddu de- dea deb dec ded dee den des det deu dna dnb dnc dnd dne dnn dns dnt dsa dsb dsc dsd dse dsn dss dst dsu dta dtb dtc dtd dte dtn dts dtt dtu dua dub duc dud due dun dus dut eaa eab eac ead eae ean eas eat eau eba ebb ebc ebd ebe ebn ebs ebt ebu ec- eca ecb ecc ecd ece ecn ecs ect ecu ed- eda edb edc edd ede edn eds edt edu eea eeb eec eed eee een ees eet en- ena enb enc end ene enn ens ent enu es- esa esb esc esd ese esn ess est esu eta etb etc etd ete etn ets ett etu eu- eua eub euc eud eue eun eus eut naa nab nac nad nae nan nas nat nau nba nbb nbc nbd nbe nbn nbs nbt nbu nca ncb ncc ncd nce ncn ncs nct ncu nda ndb ndc ndd nde ndn nds ndt ndu ne- nea neb nec ned nee nen nes net neu nna nnb nnc nne nnn nns nnt nnu nsa nsb nsc nsd nse nsn nss nst nsu nta ntb ntc ntd nte ntn nts ntt ntu nua nub nuc nud nue nun nus nut nuu saa sab sac sad sae san sas sat sau sba sbb sbc sbd sbe sbn sbs sbt sbu sca scb scc scd sce scn scs sct scu sda sdb sdc sdd sde sdn sds sdt sdu se- sea seb sec sed see sen ses set seu sna snb snc snd sne snn sns snt snu ss- ssa ssb ssc ssd sse ssn sss sst ssu sta stb stc std ste stn sts stt stu sua sub suc sud sue sun sus sut suu taa tab tac tad tae tan tas tat tau tba tbb tbc tbd tbe tbn tbs tbt tbu tca tcb tcc tcd tce tcn tcs tct tcu tda tdb tdc tdd tde tdn tds tdt tdu te- tea teb tec ted tee ten tes tet teu tna tnb tnc tnd tne tnn tns tnt tsa tsb tsc tsd tse tsn tss tst tsu tta ttb ttc ttd tte ttn tts ttt ttu tua tub tuc tud tue tun tus tut tuu ua- uaa uab uac uad uae uan uas uat uau uba ubb ubc ube ubn ubs ubt ubu uca ucb ucc ucd uce ucn ucs uct ucu uda udb udc udd ude udn uds udt udu uea ueb uec ued uee uen ues uet un- una unb unc und une unn uns unt unu usa usb usc usd use usn uss ust usu uta utb utc utd ute utn uts utt utu uua uuc uue uun uus uut uuu