a-a a-b a-c a-t aaa aab aac aad aae aas aat ab- aba abb abc abd abe abs abt ac- aca acb acc acd ace acs act ad- ada adb adc add ade ads adt aea aeb aec aed aee aes aet as- asa asb asc asd ase ass ast at- ata atb atc atd ate ats att baa bab bac bad bae bas bat bba bbb bbc bbd bbe bbs bbt bca bcb bcc bcd bce bcs bct bda bdb bdc bdd bde bds bdt be- bea beb bec bed bee bes bet bsa bsb bsc bsd bse bss bst bta btb btc btd bte bts btt c-- caa cab cac cad cae cas cat cba cbb cbc cbd cbe cbs cbt cca ccb ccc ccd cce ccs cct cda cdb cdc cdd cde cds cdt ce- cea ceb cec ced cee ces cet csa csb csc csd cse css cst cta ctb ctc ctd cte cts ctt daa dab dac dad dae das dat dba dbb dbc dbd dbe dbs dbt dca dcb dcc dcd dce dcs dct dda ddb ddc ddd dde dds ddt de- dea deb dec ded dee des det dsa dsb dsc dsd dse dss dst dta dtb dtc dtd dte dts dtt eaa eab eac ead eae eas eat eba ebb ebc ebd ebe ebs ebt ec- eca ecb ecc ecd ece ecs ect ed- eda edb edc edd ede eds edt eea eeb eec eed eee ees eet es- esa esb esc esd ese ess est eta etb etc etd ete ets ett saa sab sac sad sae sas sat sba sbb sbc sbd sbe sbs sbt sca scb scc scd sce scs sct sda sdb sdc sdd sde sds sdt se- sea seb sec sed see ses set ss- ssa ssb ssc ssd sse sss sst sta stb stc std ste sts stt taa tab tac tad tae tas tat tba tbb tbc tbd tbe tbs tbt tca tcb tcc tcd tce tcs tct tda tdb tdc tdd tde tds tdt te- tea teb tec ted tee tes tet tsa tsb tsc tsd tse tss tst tta ttb ttc ttd tte tts ttt