a-ha aaaa aaab aaac aaah aaba aabb aabc aabh aaca aacb aacc aach aacu aagh aaha abaa abab abac abag abau abb- abba abbb abca abcb abcc abch abha abua abug acaa acab acac acag acba acca accc acch accu acga acha achh achu acu- agac agag agau agba agca agcc agga aggu agha agua ahab ahac ahah ahau ahha ahua ahug auaa auca auch auga auug baaa baah baba babb babu bac- baca bacc bach baga bagg bagh baha bahu bau- baug bbau bbbb bbch bbga bcaa bcbc bcbg bcca bccc bcuc bgca bhag bhca bhcc bhuu buba bubb bubu buca bucc buch bucu buga bugg bugh buha caaa caab caac caah caba cabg cabu cac- caca cacc cach caga cagg caha cauc cbac cbbc cbca cbcc cbcu cbga cbgb cbha ccaa ccab ccac ccag ccba ccbc ccca cccb cccc cccu ccga ccgc ccha ccuc cgac cgcc cgcg chaa chab chac chag chah chau chca chch chgb chha chua chub chug cuau cub- cuba cubb cuca cucc cuga gaba gabb gabu gach gaga gagg gagu gaha gaua gaub gbag gc-c gcaa gcbc gccc gggg gghg ghug guaa guac guag guba gubb gubu guca guch guga gugb gugg gugh gugu guha haab haag haba habu hag- haga hagg hagh haha hau- haug hbag hcbc hcca hccb hccc hcch hcgh hgah hggc hhaa hhgg hhhh huac huah huba hubb huch hucu hugg hugh huhu huub uabc uaca uaua ubac ubba ucbc ucca ucha ucua ugab ugcc ugcg uguu uhuh uuuu