a-a a-b a-c a-t aaa aab aac aad aae aas aat aau ab- aba abb abc abd abe abs abt abu ac- aca acb acc acd ace acs act acu ad- ada adb adc add ade ads adt adu aea aeb aec aed aee aes aet aeu as- asa asb asc asd ase ass ast asu at- ata atb atc atd ate ats att atu au- aua aub auc aud aue aus aut b-u baa bab bac bad bae bas bat bau bba bbb bbc bbd bbe bbs bbt bbu bca bcb bcc bcd bce bcs bct bcu bda bdb bdc bdd bde bds bdt bdu be- bea beb bec bed bee bes bet beu bsa bsb bsc bsd bse bss bst bsu bta btb btc btd bte bts btt btu bua bub buc bud bue bus but buu c-- caa cab cac cad cae cas cat cau cba cbb cbc cbd cbe cbs cbt cbu cca ccb ccc ccd cce ccs cct ccu cda cdb cdc cdd cde cds cdt cdu ce- cea ceb cec ced cee ces cet ceu csa csb csc csd cse css cst csu cta ctb ctc ctd cte cts ctt ctu cua cub cuc cud cue cus cut cuu daa dab dac dad dae das dat dau dba dbb dbc dbd dbe dbs dbt dbu dca dcb dcc dcd dce dcs dct dcu dda ddb ddc ddd dde dds ddt ddu de- dea deb dec ded dee des det deu dsa dsb dsc dsd dse dss dst dsu dta dtb dtc dtd dte dts dtt dtu dua dub duc dud due dus dut eaa eab eac ead eae eas eat eau eba ebb ebc ebd ebe ebs ebt ebu ec- eca ecb ecc ecd ece ecs ect ecu ed- eda edb edc edd ede eds edt edu eea eeb eec eed eee ees eet es- esa esb esc esd ese ess est esu eta etb etc etd ete ets ett etu eu- eua eub euc eud eue eus eut saa sab sac sad sae sas sat sau sba sbb sbc sbd sbe sbs sbt sbu sca scb scc scd sce scs sct scu sda sdb sdc sdd sde sds sdt sdu se- sea seb sec sed see ses set seu ss- ssa ssb ssc ssd sse sss sst ssu sta stb stc std ste sts stt stu sua sub suc sud sue sus sut suu taa tab tac tad tae tas tat tau tba tbb tbc tbd tbe tbs tbt tbu tca tcb tcc tcd tce tcs tct tcu tda tdb tdc tdd tde tds tdt tdu te- tea teb tec ted tee tes tet teu tsa tsb tsc tsd tse tss tst tsu tta ttb ttc ttd tte tts ttt ttu tua tub tuc tud tue tus tut tuu ua- uaa uab uac uad uae uas uat uau uba ubb ubc ube ubs ubt ubu uca ucb ucc ucd uce ucs uct ucu uda udb udc udd ude uds udt udu uea ueb uec ued uee ues uet usa usb usc usd use uss ust usu uta utb utc utd ute uts utt utu uua uuc uue uus uut uuu