a-do a-ha aaaa aaab aaac aaad aaah aaba aabb aabc aabd aabh aaca aacb aacc aacd aach aaco aada aadc aaha aaoo abaa abab abac abad abb- abba abbb abbo abca abcb abcc abcd abch abda abdo abha abho aboa abob abod aboh aboo acaa acab acac acad acba acca accc accd acch acco acda acdb acdc acha achh acho acoa acod acoh adaa adab adac adad adah adao adba adbc adcc adda addc addd addo adha adhd adho adob adoc adod adoo ahab ahac ahad ahah ahha ahoa ahod aoah aoba aoca aodh baaa baad baah baba babb babo bac- baca bacc bach baco bada badb badd badh bado baha baho baoh bbad bbbb bbch bbdd bbdo bcaa bcbc bcca bccc bcda bchd bdbc bddc bddh bhao bhca bhcc boab boac boad boba bobb bobo boca boch boco boda bodb bodh bodo boha bohd boho boob booc bood booh c-bo c-cd caaa caab caac caah caba cabo cac- caca cacc cach caco cada cadc cadd cado caha caod cbac cbbc cbca cbcc cbdb cbdc cbdo cbha ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc ccdh ccha ccob ccoc ccod cdaa cdac cdad cdba cdda cddb chaa chab chac chad chah chao chca chch chha choc chod choh choo coad coba cobb cobh cobo coca coch coco coda codd coha coho coob cood cooh d-bo daab daad daba dabb dabo daca dada dado daha dbcc dcbc dcca dccb dccc dcdb dddd ddoc dhaa dhad dhao dhod doab doba dobb doca doch doco dod- doda dodd dodo doha dohc doob dood haab haad haba habo haco hada hadh haha haho hbcd hboc hcbc hcca hccb hccc hcch hdca hdda hdoc hdod hhaa hhhh hoac hoad hoba hobo hoca hoch hoda hodh hoha hoho hood obad obba obbo ocab ocac ocad ocbc occa occc ocha odac odah odbo odda oddd odoh odoo ohad ohba ohcc ohho ohob ohoh ooaa ooba ooda ooha ooho oooh oooo