a-a a-b a-c a-t aaa aab aac aae aao aat aau aav ab- aba abb abc abe abo abt abu abv ac- aca acb acc ace aco act acu acv aea aeb aec aee aeo aet aeu aev aoa aob aoc aoe aoo aot aou aov at- ata atb atc ate ato att atu atv au- aua aub auc aue auo aut auv av- ava avb avc ave avo avt avu b-u baa bab bac bae bao bat bau bav bba bbb bbc bbe bbo bbt bbu bca bcb bcc bce bco bct bcu bcv be- bea beb bec bee beo bet beu bev boa bob boc boe boo bot bou bov bta btb btc bte bto btt btu btv bua bub buc bue buo but buu bva bvb bvc bve bvo bvt bvu bvv c-- caa cab cac cae cao cat cau cav cba cbb cbc cbe cbo cbt cbu cbv cca ccb ccc cce cco cct ccu ccv ce- cea ceb cec cee ceo cet ceu cev co- coa cob coc coe coo cot cou cov cta ctb ctc cte cto ctt ctu ctv cua cub cuc cue cuo cut cuu cuv cva cvb cvc cve cvo cvt cvu cvv eaa eab eac eae eao eat eau eav eba ebb ebc ebe ebo ebt ebu ebv ec- eca ecb ecc ece eco ect ecu ecv eea eeb eec eee eeo eet eev eo- eoa eob eoc eoe eoo eot eou eta etb etc ete eto ett etu etv eu- eua eub euc eue eut euv eva evb evc eve evo evt evv oaa oab oac oae oao oat oau oav ob- oba obb obc obe obo obt obu obv oc- oca ocb occ oco oct ocu ocv oea oeb oec oee oeo oet oo- ooa oob ooc ooo oot oov ot- ota otb otc ote oto ott otu otv ou- oua ouc oue ouo out ov- ova ovb ovc ove ovo ovv taa tab tac tae tao tat tau tav tba tbb tbc tbe tbo tbt tbu tbv tca tcb tcc tce tco tct tcu tcv te- tea teb tec tee teo tet teu tev to- toa tob toc toe too tot tou tov tta ttb ttc tte tto ttt ttu ttv tua tub tuc tue tuo tut tuu tuv tva tvb tvc tve tvo tvt tvu ua- uaa uab uac uae uao uat uau uav uba ubb ubc ube ubo ubt ubu ubv uca ucb ucc uce uco uct ucu ucv uea ueb uec uee uet uoa uob uoc uoe uoo uot uta utb utc ute uto utt utu utv uua uuc uue uut uuu uva uvb uvc uve uvo uvu uvv v-a v-e vaa vab vac vae vao vat vau vav vba vbc vbo vbv vca vcc vce vco vct vcu vea veb vec vee veo vet veu voa vob voc voe voo vot vou vov vta vtb vtc vte vto vtt vtu vtv vue vut vuv vva vvb vvc vvo vvt vvv