a-a a-c a-t aaa aac aae aas aat aav aax ac- aca acc ace acs act acv acx aea aec aee aes aet aev aex as- asa asc ase ass ast asv asx at- ata atc ate ats att atv atx av- ava avc ave avs avt avx ax- axa axe axs axt axv axx c-- caa cac cae cas cat cav cax cca ccc cce ccs cct ccv ccx ce- cea cec cee ces cet cev cex csa csc cse css cst csv csx cta ctc cte cts ctt ctv ctx cva cvc cve cvs cvt cvv cvx cxc cxs cxt cxv cxx eaa eac eae eas eat eav eax ec- eca ecc ece ecs ect ecv ecx eea eec eee ees eet eev eex es- esa esc ese ess est esv esx eta etc ete ets ett etv etx eva evc eve evs evt evv ex- exa exc exe exs ext exx saa sac sae sas sat sav sax sca scc sce scs sct scv scx se- sea sec see ses set sev sex ss- ssa ssc sse sss sst ssv ssx sta stc ste sts stt stv stx sva svc sve svs svt svv svx sxc sxs sxt t-x taa tac tae tas tat tav tax tca tcc tce tcs tct tcv tcx te- tea tec tee tes tet tev tex tsa tsc tse tss tst tsv tsx tta ttc tte tts ttt ttv ttx tva tvc tve tvs tvt tvx txe txs txt v-a v-e vaa vac vae vas vat vav vax vca vcc vce vcs vct vcx vea vec vee ves vet vex vsa vsc vse vss vst vsv vta vtc vte vts vtt vtv vtx vva vvc vvs vvt vvv vxa vxs vxv xaa xac xas xat xav xcv xcx xee xes xet xev xex xsa xsc xss xst xtc xts xtv xtx xvt xxv xxx