a-a a-b a-c a-t aaa aab aac aad aae aaf aas aat aau ab- aba abb abc abd abe abf abs abt abu ac- aca acb acc acd ace acf acs act acu ad- ada adb adc add ade adf ads adt adu aea aeb aec aed aee aef aes aet aeu af- afa afb afc afd afe aff afs aft afu as- asa asb asc asd ase asf ass ast asu at- ata atb atc atd ate atf ats att atu au- aua aub auc aud aue auf aus aut b-u baa bab bac bad bae baf bas bat bau bba bbb bbc bbd bbe bbf bbs bbt bbu bca bcb bcc bcd bce bcf bcs bct bcu bda bdb bdc bdd bde bdf bds bdt bdu be- bea beb bec bed bee bef bes bet beu bfa bfb bfc bfd bfe bff bfs bft bfu bsa bsb bsc bsd bse bsf bss bst bsu bta btb btc btd bte btf bts btt btu bua bub buc bud bue buf bus but buu c-- caa cab cac cad cae caf cas cat cau cba cbb cbc cbd cbe cbf cbs cbt cbu cca ccb ccc ccd cce ccf ccs cct ccu cda cdb cdc cdd cde cdf cds cdt cdu ce- cea ceb cec ced cee cef ces cet ceu cfa cfb cfc cfd cfe cff cfs cft cfu csa csb csc csd cse csf css cst csu cta ctb ctc ctd cte ctf cts ctt ctu cua cub cuc cud cue cuf cus cut cuu daa dab dac dad dae daf das dat dau dba dbb dbc dbd dbe dbf dbs dbt dbu dca dcb dcc dcd dce dcf dcs dct dcu dda ddb ddc ddd dde ddf dds ddt ddu de- dea deb dec ded dee def des det deu dfa dfb dfc dfd dfe dff dfs dft dfu dsa dsb dsc dsd dse dsf dss dst dsu dta dtb dtc dtd dte dtf dts dtt dtu dua dub duc dud due duf dus dut eaa eab eac ead eae eaf eas eat eau eba ebb ebc ebd ebe ebf ebs ebt ebu ec- eca ecb ecc ecd ece ecf ecs ect ecu ed- eda edb edc edd ede edf eds edt edu eea eeb eec eed eee eef ees eet ef- efa efb efc efd efe eff efs eft es- esa esb esc esd ese esf ess est esu eta etb etc etd ete etf ets ett etu eu- eua eub euc eud eue euf eus eut faa fab fac fad fae faf fas fat fau fba fbb fbc fbd fbe fbf fbs fbt fbu fca fcb fcc fcd fce fcf fcs fct fcu fda fdb fdc fdd fde fdf fds fdt fdu fea feb fec fed fee fef fes fet feu ffa ffc ffd ffe fff ffs fft ffu fsa fsb fsc fsd fse fsf fss fst fsu fta ftb ftc ftd fte ftf fts ftt ftu fua fub fud fue fuf fus fut fuu saa sab sac sad sae saf sas sat sau sba sbb sbc sbd sbe sbf sbs sbt sbu sca scb scc scd sce scf scs sct scu sda sdb sdc sdd sde sdf sds sdt sdu se- sea seb sec sed see sef ses set seu sfa sfb sfc sfd sfe sff sfs sft sfu ss- ssa ssb ssc ssd sse ssf sss sst ssu sta stb stc std ste stf sts stt stu sua sub suc sud sue suf sus sut suu taa tab tac tad tae taf tas tat tau tba tbb tbc tbd tbe tbf tbs tbt tbu tca tcb tcc tcd tce tcf tcs tct tcu tda tdb tdc tdd tde tdf tds tdt tdu te- tea teb tec ted tee tef tes tet teu tfa tfb tfc tfd tfe tff tfs tft tfu tsa tsb tsc tsd tse tsf tss tst tsu tta ttb ttc ttd tte ttf tts ttt ttu tua tub tuc tud tue tuf tus tut tuu ua- uaa uab uac uad uae uaf uas uat uau uba ubb ubc ube ubf ubs ubt ubu uca ucb ucc ucd uce ucf ucs uct ucu uda udb udc udd ude udf uds udt udu uea ueb uec ued uee uef ues uet ufa ufc ufd ufe uff ufs uft ufu usa usb usc usd use usf uss ust usu uta utb utc utd ute utf uts utt utu uua uuc uue uus uut uuu