a-a a-b a-c a-t aaa aab aac aat aav ab- aba abb abc abt abv ac- aca acb acc act acv at- ata atb atc att atv av- ava avb avc avt baa bab bac bat bav bba bbb bbc bbt bca bcb bcc bct bcv bta btb btc btt btv bva bvb bvc bvt bvv c-- caa cab cac cat cav cba cbb cbc cbt cbv cca ccb ccc cct ccv cta ctb ctc ctt ctv cva cvb cvc cvt cvv taa tab tac tat tav tba tbb tbc tbt tbv tca tcb tcc tct tcv tta ttb ttc ttt ttv tva tvb tvc tvt v-a vaa vab vac vat vav vba vbc vbv vca vcc vct vta vtb vtc vtt vtv vva vvb vvc vvt vvv