a-ha aaaa aaab aaac aaah aaar aaba aabb aabc aabh aaca aacb aacc aach aaco aacr aaha aaoo aara aarc aaro abaa abab abac abar abb- abba abbb abbo abbr abca abcb abcc abch abcr abha abho abhr aboa abob aboh aboo abor abra abrc abro acaa acab acac acar acba acca accc acch acco acha achh acho achr acoa acoh acor acr- acra acrc acro acrr ahab ahac ahah ahar ahha ahoa ahor ahra ahrc ahrr aoah aoba aoca aora aorb arab arac arah arar arba arbh arc- arca arch arco arh- aroa arob aroo aror arr- arra arrc arrh arro arrr baaa baah baar baba babb babo babr bac- baca bacc bach baco baha baho bahr baoh bar- bara barb barc barh baro barr bbbb bbch bbrc bcaa bcar bcbc bcca bccc bcor bcra bhao bhar bhca bhcc bhor bhra boab boac boar boba bobb bobo boca boch boco boha boho bohr boob booc booh boor bor- bora borh boro borr brab brac brah brao brca brcb broa brob broc broh broo bror brrr c-bo caaa caab caac caah caba cabo cac- caca cacc cach caco cacr caha caor cara carb carc caro carr cbac cbar cbbc cbca cbcc cbcr cbha cbrh ccaa ccab ccac ccar ccba ccbc ccca cccb cccc ccha cchr ccob ccoc ccra ccrc chaa chab chac chah chao char chca chch chha choc choh choo chor chra chrb chrc chro chrr coba cobb cobh cobo coca coch coco coha coho coob cooh cor- cora corb corc coro corr crab crac crar crbc crca crcc crcr crob croc croh croo cror haab haar haba habo haco haha haho haor hara harc harh haro harr hbar hboc hcbc hcca hccb hccc hcch hhaa hhhh hoac hoar hoba hobo hoca hoch hocr hoha hoho hoor hora horc horo horr hrac hrob hrrc oara obba obbo obor obra obrh obro ocab ocac ocbc occa occc ocha ocra ocro ocrr ohba ohcc ohho ohob ohoh ohra ooaa ooba oocr ooha ooho oooh oooo oora orab orac orah orao orar orba orbb orbo orca orch orco oro- oror orra orro raab raba rabb rabo rac- raca racc rach raco raha rahr raob raoc raoh rara rarb raro rbbb rbbr rboh rcac rcbc rcbo rccb rccc rchb rhoa rhob rhoc rhoh roab roar rob- roba robb robo roca rocc roch roco roha rohr roob roor rora rorc roro rrah rrrr