a-a a-c a-t aaa aac aas aat aav ac- aca acc acs act acv as- asa asc ass ast asv at- ata atc ats att atv av- ava avc avs avt c-- caa cac cas cat cav cca ccc ccs cct ccv csa csc css cst csv cta ctc cts ctt ctv cva cvc cvs cvt cvv saa sac sas sat sav sca scc scs sct scv ss- ssa ssc sss sst ssv sta stc sts stt stv sva svc svs svt svv taa tac tas tat tav tca tcc tcs tct tcv tsa tsc tss tst tsv tta ttc tts ttt ttv tva tvc tvs tvt v-a vaa vac vas vat vav vca vcc vcs vct vsa vsc vss vst vsv vta vtc vts vtt vtv vva vvc vvs vvt vvv