a-a a-b a-c a-t aaa aab aac aan aao aat aav ab- aba abb abc abn abo abt abv ac- aca acb acc acn aco act acv an- ana anb anc ann ano ant anv aoa aob aoc aon aoo aot aov at- ata atb atc atn ato att atv av- ava avb avc avn avo avt baa bab bac ban bao bat bav bba bbb bbc bbn bbo bbt bca bcb bcc bcn bco bct bcv bna bnb bnc bnn bno bnt bnv boa bob boc bon boo bot bov bta btb btc btn bto btt btv bva bvb bvc bvn bvo bvt bvv c-- caa cab cac can cao cat cav cba cbb cbc cbn cbo cbt cbv cca ccb ccc ccn cco cct ccv cn- cna cnb cnc cnn cno cnt cnv co- coa cob coc con coo cot cov cta ctb ctc ctn cto ctt ctv cva cvb cvc cvn cvo cvt cvv naa nab nac nan nao nat nav nba nbb nbc nbn nbo nbt nbv nca ncb ncc ncn nco nct ncv nna nnb nnc nnn nno nnt nnv no- noa nob noc non noo not nov nta ntb ntc ntn nto ntt ntv nva nvb nvc nvn nvt nvv oaa oab oac oan oao oat oav ob- oba obb obc obn obo obt obv oc- oca ocb occ ocn oco oct ocv on- ona onb onc onn ono ont oo- ooa oob ooc oon ooo oot oov ot- ota otb otc otn oto ott otv ov- ova ovb ovc ovo ovv taa tab tac tan tao tat tav tba tbb tbc tbn tbo tbt tbv tca tcb tcc tcn tco tct tcv tna tnb tnc tnn tno tnt to- toa tob toc ton too tot tov tta ttb ttc ttn tto ttt ttv tva tvb tvc tvn tvo tvt v-a vaa vab vac van vao vat vav vba vbc vbo vbv vca vcc vcn vco vct vn- vna vno vnv voa vob voc von voo vot vov vta vtb vtc vto vtt vtv vva vvb vvc vvo vvt vvv