-vac aaaa aaab aaac aaav aaba aabb aabc aaca aacb aacc aaco aacu aacv aaoo aava abaa abab abac abau abb- abba abbb abbo abca abcb abcc aboa abob aboo abou abov abua abva acaa acab acac acba acca accc acco accu acoa acou acu- acuo acvv aoba aoca auaa auca avab avao avcc avco avou avva avvo baaa baba babb babo babu bac- baca bacc baco bau- bava bavu bbau bbbb bcaa bcbc bcca bccc bcuc bcvo boab boac boba bobb bobo bobu boca boco bocu boob booc boua bova bovo buba bubb bubo bubu buca bucc buco bucu c-bo caaa caab caac caba cabo cabu cac- caca cacc caco cauc cauo cava cavo cavu cbac cbbc cbca cbcc cbcu cbva cbvb ccaa ccab ccac ccba ccbc ccca cccb cccc cccu cccv ccob ccoc ccuc ccvo coba cobb cobo cobu coca coco cocu coob coua coub cova covo cuau cub- cuba cubb cuca cucc cvac cvca cvcc oaau obba obbo ocab ocac ocbc occa occc ooaa ooba oooo ouac oucc ouu- ovo- ovoo uabc uaca uaoc uaua ubac ubba ubbo uboc ucav ucbc ucca ucua uocc uovo uuoc uuuu uv-a uv-b uv-c uvaa uvac uvvu vaca vaco vava vbcc voca vooc vuca vuco vvob vvvv