a-a a-b a-c a-t aaa aab aac aao aat aau aav ab- aba abb abc abo abt abu abv ac- aca acb acc aco act acu acv aoa aob aoc aoo aot aou aov at- ata atb atc ato att atu atv au- aua aub auc auo aut auv av- ava avb avc avo avt avu b-u baa bab bac bao bat bau bav bba bbb bbc bbo bbt bbu bca bcb bcc bco bct bcu bcv boa bob boc boo bot bou bov bta btb btc bto btt btu btv bua bub buc buo but buu bva bvb bvc bvo bvt bvu bvv c-- caa cab cac cao cat cau cav cba cbb cbc cbo cbt cbu cbv cca ccb ccc cco cct ccu ccv co- coa cob coc coo cot cou cov cta ctb ctc cto ctt ctu ctv cua cub cuc cuo cut cuu cuv cva cvb cvc cvo cvt cvu cvv oaa oab oac oao oat oau oav ob- oba obb obc obo obt obu obv oc- oca ocb occ oco oct ocu ocv oo- ooa oob ooc ooo oot oov ot- ota otb otc oto ott otu otv ou- oua ouc ouo out ov- ova ovb ovc ovo ovv taa tab tac tao tat tau tav tba tbb tbc tbo tbt tbu tbv tca tcb tcc tco tct tcu tcv to- toa tob toc too tot tou tov tta ttb ttc tto ttt ttu ttv tua tub tuc tuo tut tuu tuv tva tvb tvc tvo tvt tvu ua- uaa uab uac uao uat uau uav uba ubb ubc ubo ubt ubu ubv uca ucb ucc uco uct ucu ucv uoa uob uoc uoo uot uta utb utc uto utt utu utv uua uuc uut uuu uva uvb uvc uvo uvu uvv v-a vaa vab vac vao vat vau vav vba vbc vbo vbv vca vcc vco vct vcu voa vob voc voo vot vou vov vta vtb vtc vto vtt vtu vtv vut vuv vva vvb vvc vvo vvt vvv