a-ha aaaa aaab aaac aaah aaba aabb aabc aabh aaca aacb aacc aach aaco aaha aaoo abaa abab abac abb- abba abbb abbo abca abcb abcc abch abha abho aboa abob aboh aboo acaa acab acac acba acca accc acch acco acha achh acho acoa acoh ahab ahac ahah ahha ahoa aoah aoba aoca baaa baah baba babb babo bac- baca bacc bach baco baha baho baoh bbbb bbch bcaa bcbc bcca bccc bhao bhca bhcc boab boac boba bobb bobo boca boch boco boha boho boob booc booh c-bo caaa caab caac caah caba cabo cac- caca cacc cach caco caha cbac cbbc cbca cbcc cbha ccaa ccab ccac ccba ccbc ccca cccb cccc ccha ccob ccoc chaa chab chac chah chao chca chch chha choc choh choo coba cobb cobh cobo coca coch coco coha coho coob cooh haab haba habo haco haha haho hboc hcbc hcca hccb hccc hcch hhaa hhhh hoac hoba hobo hoca hoch hoha hoho obba obbo ocab ocac ocbc occa occc ocha ohba ohcc ohho ohob ohoh ooaa ooba ooha ooho oooh oooo