a-ha aaaa aaab aaac aaad aaah aaba aabb aabc aabd aabh aaca aacb aacc aacd aach aacu aada aadc aadu aaha abaa abab abac abad abau abb- abba abbb abca abcb abcc abcd abch abda abdu abha abua abud acaa acab acac acad acba acca accc accd acch accu acda acdb acdc acha achh achu acu- adaa adab adac adad adah adba adbc adcc adda addc addd addu adha adhd adhu adua adub ahab ahac ahad ahah ahau ahha ahua auaa auca auch audc audh baaa baad baah baba babb babu bac- baca bacc bach bada badb badd badh badu baha bahu bau- baud bbad bbau bbbb bbch bbdd bcaa bcbc bcca bccc bcda bchd bcuc bdbc bddc bddh bhca bhcc bhuu buad buba bubb bubu buca bucc buch bucu buda budb budd budu buha c-cd caaa caab caac caah caba cabu cac- caca cacc cach cada cadc cadd cadu caha cauc cbac cbbc cbca cbcc cbcu cbdb cbdc cbha ccaa ccab ccac ccad ccba ccbc ccca cccb cccc cccu ccdc ccdh ccha ccuc cdaa cdac cdad cdba cdda cddb chaa chab chac chad chah chau chca chch chha chua chub chud cuau cub- cuba cubb cuca cucc cuda daab daad daau daba dabb dabu daca dada dadu daha dahu daub daud dbcc dcbc dcca dccb dccc dccu dcdb dddd ddub dhaa dhad dhau duaa duab duad duah dub- duba dubb dubc dubh dubu duca duch duda dudd dudu duha duhu haab haad haba habu hada hadh hadu haha hau- haud hbcd hcbc hcca hccb hccc hcch hdca hdda hhaa hhhh huac huah huba hubb huch hucu huda hudd hudu huhu huub uabc uaca uaua ubac ubba ubud ucad ucbc ucca ucdc ucdd ucha ucua udaa udad udau udbc udca uh-d uhuh uuuu