-hou a-ha aaaa aaab aaac aaah aaba aabb aabc aabh aaca aacb aacc aach aaco aacu aaha aaoo abaa abab abac abau abb- abba abbb abbo abca abcb abcc abch abha abho aboa abob aboh aboo abou abua acaa acab acac acba acca accc acch acco accu acha achh acho achu acoa acoh acou acu- acuo ahab ahac ahah ahau ahha ahoa ahua aoah aoba aoca auaa auca auch baaa baah baba babb babo babu bac- baca bacc bach baco baha baho bahu baoh bau- bbau bbbb bbch bcaa bcbc bcca bccc bcuc bhao bhca bhcc bhuu boab boac boba bobb bobo bobu boca boch boco bocu boha boho bohu boob booc booh boua bouh buba bubb bubo bubu buca bucc buch buco bucu buha buho c-bo caaa caab caac caah caba cabo cabu cac- caca cacc cach caco caha cauc cauo cbac cbbc cbca cbcc cbcu cbha ccaa ccab ccac ccba ccbc ccca cccb cccc cccu ccha ccob ccoc ccuc chaa chab chac chah chao chau chca chch chha choc choh choo chou chua chub coba cobb cobh cobo cobu coca coch coco cocu coha coho coob cooh coua coub cuau cub- cuba cubb cuca cucc haab haba habo habu haco haha haho hau- hboc hcbc hcca hccb hccc hcch hhaa hhhh hoac hoba hobo hoca hoch hoha hoho huac huah huba hubb hubo huch hucu huhu huub oaau oahu obba obbo obuh ocab ocac ocbc occa occc ocha ohau ohba ohcc ohho ohob ohoh ooaa ooba ooha ooho oooh oooo ouac oucc ouch ouu- uabc uaca uaoc uaua ubac ubba ubbo uboc ucbc ucca ucha ucho ucua uhoh uhuh uocc uuoc uuuu