a-do a-ha aaaa aaab aaac aaad aaaf aaah aaba aabb aabc aabd aabh aaca aacb aacc aacd aacf aach aaco aada aadc aafa aafb aafc aafd aaff aaha aaoo abaa abab abac abad abaf abb- abba abbb abbo abca abcb abcc abcd abcf abch abda abdo abff abha abho aboa abob abod abof aboh aboo acaa acab acac acad acba acca accc accd accf acch acco acda acdb acdc acdf acfc acfd acha achh acho acoa acod acoh adaa adab adac adad adah adao adba adbc adcc adda addc addd addo adfa adfc adha adhd adho adob adoc adod adoo afaa afad afao afca afcb afcc afch afdb afdc affa affc affo afoa afoo ahab ahac ahad ahah ahfa ahha ahoa ahod aoah aoba aoca aodh baaa baad baaf baah baba babb babo bac- baca bacc bach baco bada badb badd badh bado bafc baff bafo baha baho baoh bbad bbbb bbch bbdd bbdo bbfc bcaa bcbc bcca bccc bcda bcfc bchd bcof bdbc bddc bddh bfca bhao bhca bhcc bhff boab boac boad boba bobb bobo boca boch boco boda bodb bodh bodo bofa bofd boff bofh boha bohd boho boob booc bood boof booh c-bo c-cd caaa caab caac caaf caah caba cabf cabo cac- caca cacc cach caco cada cadc cadd cado cafa cafb cafc caff caha caod cbac cbbc cbca cbcc cbdb cbdc cbdo cbfb cbfc cbha ccaa ccab ccac ccad ccaf ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdh ccfa ccfc ccfd ccff ccha ccob ccoc ccod cdaa cdac cdad cdba cdbf cdda cddb cdfa cfaa cfab cfac cfao cfbc cfca cfcb cfcf cfco cfda cffb cfoa chaa chab chac chad chaf chah chao chca chch chfa chfc chha choc chod choh choo coad coba cobb cobh cobo coca coch coco coda codd cofc coff coha coho coob cood coof cooh d-bo daab daad daba dabb dabo daca dada dado dafa dafc daff dafo daha dbcc dbfc dbfo dcbc dcca dccb dccc dcdb dcfc dddd ddoc dfaf dfcc dfco dffa dhaa dhad dhao dhfc dhod doab doba dobb doca doch doco dod- doda dodd dodo doff doha dohc doob dood doof faaa faac faad faah faba fabd fabo faca facc fach fada fadd fado fafa fafc faff fafo faha fahd fcab fcba fcca fccf fcch fcda fdca fdoa fdoc ffcc ffff foad foaf foba foca foch foco foda fofo food foof haab haad haaf haba habo haco hada hadf hadh hafb hafd haff haha haho hbcd hbfc hboc hcbc hcca hccb hccc hcch hcfa hcfc hdca hdda hdfc hdoc hdod hfba hhaa hhhh hhof hoac hoad hoba hobo hoca hoch hoda hodh hoff hoha hoho hood hoof oafc oafo obad obba obbo ocab ocac ocad ocbc occa occc ocfa ocha odac odah odbo odda oddd odoh odoo ofah off- offa offc offh offo ohad ohba ohcc ohho ohob ohoh ooaa ooba ooda ooff ooha ooho oooh oooo