a-ha aaaa aaab aaac aaah aaar aaba aabb aabc aabh aaca aacb aacc aach aacr aacu aaha aara aarc aaru abaa abab abac abar abau abb- abba abbb abbr abca abcb abcc abch abcr abha abhr abra abrc abua acaa acab acac acar acba acca accc acch accu acha achh achr achu acr- acra acrc acrr acu- acur ahab ahac ahah ahar ahau ahha ahra ahrc ahrr ahua arab arac arah arar arau arba arbh arc- arca arch arh- arr- arra arrc arrh arrr arru arua arub auaa auca auch aur- aura baaa baah baar baba babb babr babu bac- baca bacc bach baha bahr bahu bar- bara barb barc barh barr baru bau- baur bbau bbbb bbch bbrc bcaa bcar bcbc bcca bccc bcra bcru bcuc bhar bhca bhcc bhra bhur bhuu brab brac brah brau brca brcb brrr bruc bruh buar buba bubb bubu buca bucc buch bucu buha buhr bur- bura burb burh burr buru caaa caab caac caah caba cabu cac- caca cacc cach cacr caha cara carb carc carr cauc cbac cbar cbbc cbca cbcc cbcr cbcu cbha cbrh ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccha cchr ccra ccrc ccuc chaa chab chac chah char chau chca chch chha chra chrb chrc chrr chua chub chur crab crac crar crau crbc crbu crca crcc crcr crub cuau cub- cuba cubb cuca cucc cura curb curr haab haar haba habu haha hara harc harh harr haru hau- hbar hcbc hcca hccb hccc hcch hhaa hhhh hrac hrrc huac huah huba hubb huch hucu huhu hura hurr huru huub raab raba rabb rabu rac- raca racc rach racu raha rahr rahu rara rarb raua raub rauc rbbb rbbr rcac rcbc rccb rccc rchb rhau rrah rrrr ruah ruba rubb rubu ruca ruch ruhh ruhr rura rurc ruru uabc uaca uarc uaru uaua ubac ubar ubba ubra ucar ucbc ucca ucha ucrc ucua uhuh urac urau urba urca urch urra urrh urur uuuu