a-a a-b a-c a-t aaa aab aac aar aat aav ab- aba abb abc abr abt abv ac- aca acb acc acr act acv ar- ara arb arc arr art arv at- ata atb atc atr att atv av- ava avb avc avr avt baa bab bac bar bat bav bba bbb bbc bbr bbt bca bcb bcc bcr bct bcv bra brb brr brt brv bta btb btc btr btt btv bva bvb bvc bvr bvt bvv c-- caa cab cac car cat cav cba cbb cbc cbr cbt cbv cca ccb ccc ccr cct ccv cra crb crc crr crt crv cta ctb ctc ctr ctt ctv cva cvb cvc cvr cvt cvv ra- raa rab rac rar rat rav rba rbb rbc rbr rbt rca rcb rcc rcr rct rcv rra rrb rrc rrr rrt rta rtb rtc rtr rtt rtv rva rvb rvc rvr rvt rvv taa tab tac tar tat tav tba tbb tbc tbr tbt tbv tca tcb tcc tcr tct tcv tra trb trc trr trt trv tta ttb ttc ttr ttt ttv tva tvb tvc tvr tvt v-a vaa vab vac var vat vav vba vbc vbr vbv vca vcc vcr vct vra vrb vrc vrr vrt vta vtb vtc vtr vtt vtv vva vvb vvc vvr vvt vvv