a-a a-b a-c a-t aaa aab aac aae aat aav ab- aba abb abc abe abt abv ac- aca acb acc ace act acv aea aeb aec aee aet aev at- ata atb atc ate att atv av- ava avb avc ave avt baa bab bac bae bat bav bba bbb bbc bbe bbt bca bcb bcc bce bct bcv be- bea beb bec bee bet bev bta btb btc bte btt btv bva bvb bvc bve bvt bvv c-- caa cab cac cae cat cav cba cbb cbc cbe cbt cbv cca ccb ccc cce cct ccv ce- cea ceb cec cee cet cev cta ctb ctc cte ctt ctv cva cvb cvc cve cvt cvv eaa eab eac eae eat eav eba ebb ebc ebe ebt ebv ec- eca ecb ecc ece ect ecv eea eeb eec eee eet eev eta etb etc ete ett etv eva evb evc eve evt evv taa tab tac tae tat tav tba tbb tbc tbe tbt tbv tca tcb tcc tce tct tcv te- tea teb tec tee tet tev tta ttb ttc tte ttt ttv tva tvb tvc tve tvt v-a v-e vaa vab vac vae vat vav vba vbc vbv vca vcc vce vct vea veb vec vee vet vta vtb vtc vte vtt vtv vva vvb vvc vvt vvv