a-ha aaaa aaab aaac aaah aaar aaba aabb aabc aabh aaca aacb aacc aach aacr aaha aara aarc abaa abab abac abar abb- abba abbb abbr abca abcb abcc abch abcr abha abhr abra abrc acaa acab acac acar acba acca accc acch acha achh achr acr- acra acrc acrr ahab ahac ahah ahar ahha ahra ahrc ahrr arab arac arah arar arba arbh arc- arca arch arh- arr- arra arrc arrh arrr baaa baah baar baba babb babr bac- baca bacc bach baha bahr bar- bara barb barc barh barr bbbb bbch bbrc bcaa bcar bcbc bcca bccc bcra bhar bhca bhcc bhra brab brac brah brca brcb brrr caaa caab caac caah caba cac- caca cacc cach cacr caha cara carb carc carr cbac cbar cbbc cbca cbcc cbcr cbha cbrh ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccha cchr ccra ccrc chaa chab chac chah char chca chch chha chra chrb chrc chrr crab crac crar crbc crca crcc crcr haab haar haba haha hara harc harh harr hbar hcbc hcca hccb hccc hcch hhaa hhhh hrac hrrc raab raba rabb rac- raca racc rach raha rahr rara rarb rbbb rbbr rcac rcbc rccb rccc rchb rrah rrrr