-hou a-fu a-ha aaaa aaab aaac aaaf aaah aaba aabb aabc aabh aaca aacb aacc aacf aach aaco aacu aafa aafb aafc aaff aaha aaoo abaa abab abac abaf abau abb- abba abbb abbo abca abcb abcc abcf abch abff abha abho aboa abob abof aboh aboo abou abua abuf acaa acab acac acba acca accc accf acch acco accu acfc acha achh acho achu acoa acoh acou acu- acuf acuo afaa afao afca afcb afcc afch afcu affa affc affo afoa afoo afua ahab ahac ahah ahau ahfa ahha ahoa ahua aoah aoba aoca aouf auaa auca auch aufc baaa baaf baah baba babb babo babu bac- baca bacc bach baco bafc baff bafo baha baho bahu baoh bau- bauf bbau bbbb bbch bbfc bcaa bcbc bcca bccc bcfc bcof bcuc bfca bhao bhca bhcc bhff bhuu boab boac boba bobb bobo bobu boca boch boco bocu bofa boff bofh bofu boha boho bohu boob booc boof booh boua bouf bouh buba bubb bubo bubu buca bucc buch buco bucu bufc buff bufo buha buho c-bo caaa caab caac caaf caah caba cabf cabo cabu cac- caca cacc cach caco cafa cafb cafc caff cafu caha cauc cauf cauo cbac cbbc cbca cbcc cbcu cbfb cbfc cbha ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf cccu ccfa ccfc ccff ccha ccob ccoc ccuc cfaa cfab cfac cfao cfbc cfca cfcb cfcf cfco cffb cfoa chaa chab chac chaf chah chao chau chca chch chfa chfc chha choc choh choo chou chua chub coba cobb cobh cobo cobu coca coch coco cocu cofc coff coha coho coob coof cooh coua coub cuau cub- cuba cubb cuca cucc cufa cufc cuff cufo faaa faac faah faba fabo fabu faca facc fach fafa fafc faff fafo faha fcab fcba fcca fccf fcch ffcc ffff foaf foba foca foch foco fofo foof foua fubb fubu fuc- fuca fufc fuff fufu haab haaf haba habo habu haco hafb haff haha haho hau- hauf hbfc hboc hcbc hcca hccb hccc hcch hcfa hcfc hfba hhaa hhhh hhof hoac hoba hobo hoca hoch hoff hofu hoha hoho hoof houf huac huah huba hubb hubo huch hucu hufc huff hufu huhu huub oaau oafc oafo oahu obba obbo obuh ocab ocac ocbc occa occc ocfa ocha ofah off- offa offc offh offo offu ohau ohba ohcc ohho ohob ohoh ooaa ooba ooff ooha ooho oooh oooo ouac oucc ouch oufc ouff ouu- uabc uaca uafa uaoc uaua ubac ubba ubbo uboc ucbc ucca ucfa ucfb ucha ucho ucua ufcu uffa uhoh uhuh uocc uofa uofo uuoc uuuu