a-ha aaaa aaab aaac aaah aaba aabb aabc aabh aaca aacb aacc aach aacu aaha abaa abab abac abau abb- abba abbb abca abcb abcc abch abha abua acaa acab acac acba acca accc acch accu acha achh achu acu- ahab ahac ahah ahau ahha ahua auaa auca auch baaa baah baba babb babu bac- baca bacc bach baha bahu bau- bbau bbbb bbch bcaa bcbc bcca bccc bcuc bhca bhcc bhuu buba bubb bubu buca bucc buch bucu buha caaa caab caac caah caba cabu cac- caca cacc cach caha cauc cbac cbbc cbca cbcc cbcu cbha ccaa ccab ccac ccba ccbc ccca cccb cccc cccu ccha ccuc chaa chab chac chah chau chca chch chha chua chub cuau cub- cuba cubb cuca cucc haab haba habu haha hau- hcbc hcca hccb hccc hcch hhaa hhhh huac huah huba hubb huch hucu huhu huub uabc uaca uaua ubac ubba ucbc ucca ucha ucua uhuh uuuu