-vac aaaa aaab aaac aaav aaba aabb aabc aabt aaca aacb aacc aaco aact aacu aacv aaoo aata aatc aatt aava abaa abab abac abat abau abb- abba abbb abbo abbt abca abcb abcc abct aboa abob aboo abot abou abov abta abtu abua abut abva ac-t acaa acab acac acat acba acca accc acco acct accu acoa acot acou acta actc acto actt actu actv acu- acuo acut acvv aoba aoca aotc aout at-t ataa atab atac atat atca atcc atco atob atoc atot atta atto attu atua atub atuc auaa auca auct aut- auto avab avao avat avcc avco avot avou avva avvo baaa baat baba babb babo babu bac- baca bacc baco bact bata batc bato batt batu bau- bava bavu bbau bbbb bcaa bcat bcbc bcca bccc bctc bcuc bcvo boab boac boat boba bobb bobo bobu boca boco bocu boob booc boot bota botb boto bott boua bout bova bovo btaa btcc btob bttb buat buba bubb bubo bubu buca bucc buco bucu but- buta buto butt c-bo caaa caab caac caat caba cabo cabu cac- caca cacc caco cat- cata catb catc cato catt catu catv cauc cauo caut cava cavo cavu cbac cbat cbbc cbca cbcc cbct cbcu cbot cbta cbtc cbtv cbva cbvb ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccu cccv ccob ccoc cctb cctc cctt cctv ccuc ccut ccvo coat coba cobb cobo cobu coca coco coct cocu coob coot cota cotb cotc coto cott cotu coua coub cout cova covo ctab ctba ctca ctot ctta ctvo ctvt cuau cub- cuba cubb cuca cucc cut- cuta cutc cuto cutt cutv cvac cvca cvcc oaau obba obbo obot ocab ocac ocat ocbc occa occc occt oct- octa octo ooaa ooba oooo ootb otac oto- otoo otov otta otto ottu ouac ouat oucc out- outa outb outo ouu- ovo- ovoo ovot taa- taat taba tabb tabc tabo tabu taca tacc taco tact tacv taoa taou tata tatb tato tatt tatu tatv taua taub tauc taut tava tavo tbca tbcb tbcc tbta tcca tccc tccu tcov tctc toab toat toau toba tobo tobt tobu toca toco tooa toot tota totc toto tott tout touv tova tovo ttab ttbb tttt tuao tuat tuba tubb tubo tubu tuca tucc tuco tuta tuto tutt tutu tuuo tuva tvac tvtv uabc uaca uaoc uata uatu uatv uaua ubac ubba ubbo uboc ucat ucav ucbc ucca uctv ucua ucut uocc uovo utac utau utto uttu uuoc uuta uuuu uv-a uv-b uv-c uvaa uvac uvat uvvu vaat vaca vaco vata vato vatt vatu vaut vava vbcc vcat voat voca vooc voot vota voto vout vtac vuca vuco vutv vvob vvvv