a-a a-b a-c a-t aaa aab aac aae aas aat aav ab- aba abb abc abe abs abt abv ac- aca acb acc ace acs act acv aea aeb aec aee aes aet aev as- asa asb asc ase ass ast asv at- ata atb atc ate ats att atv av- ava avb avc ave avs avt baa bab bac bae bas bat bav bba bbb bbc bbe bbs bbt bca bcb bcc bce bcs bct bcv be- bea beb bec bee bes bet bev bsa bsb bsc bse bss bst bsv bta btb btc bte bts btt btv bva bvb bvc bve bvs bvt bvv c-- caa cab cac cae cas cat cav cba cbb cbc cbe cbs cbt cbv cca ccb ccc cce ccs cct ccv ce- cea ceb cec cee ces cet cev csa csb csc cse css cst csv cta ctb ctc cte cts ctt ctv cva cvb cvc cve cvs cvt cvv eaa eab eac eae eas eat eav eba ebb ebc ebe ebs ebt ebv ec- eca ecb ecc ece ecs ect ecv eea eeb eec eee ees eet eev es- esa esb esc ese ess est esv eta etb etc ete ets ett etv eva evb evc eve evs evt evv saa sab sac sae sas sat sav sba sbb sbc sbe sbs sbt sbv sca scb scc sce scs sct scv se- sea seb sec see ses set sev ss- ssa ssb ssc sse sss sst ssv sta stb stc ste sts stt stv sva svb svc sve svs svt svv taa tab tac tae tas tat tav tba tbb tbc tbe tbs tbt tbv tca tcb tcc tce tcs tct tcv te- tea teb tec tee tes tet tev tsa tsb tsc tse tss tst tsv tta ttb ttc tte tts ttt ttv tva tvb tvc tve tvs tvt v-a v-e vaa vab vac vae vas vat vav vba vbc vbs vbv vca vcc vce vcs vct vea veb vec vee ves vet vsa vsb vsc vse vss vst vsv vta vtb vtc vte vts vtt vtv vva vvb vvc vvs vvt vvv