a-ha aaaa aaab aaah aaar aaba aabb aabh aaha aaoo aara aaro abaa abab abar abb- abba abbb abbo abbr abha abho abhr aboa abob aboh aboo abor abra abro ahab ahah ahar ahha ahoa ahor ahra ahrr aoah aoba aora aorb arab arah arar arba arbh arh- aroa arob aroo aror arr- arra arrh arro arrr baaa baah baar baba babb babo babr baha baho bahr baoh bar- bara barb barh baro barr bbbb bhao bhar bhor bhra boab boar boba bobb bobo boha boho bohr boob booh boor bor- bora borh boro borr brab brah brao broa brob broh broo bror brrr haab haar haba habo haha haho haor hara harh haro harr hbar hhaa hhhh hoar hoba hobo hoha hoho hoor hora horo horr hrob oara obba obbo obor obra obrh obro ohba ohho ohob ohoh ohra ooaa ooba ooha ooho oooh oooo oora orab orah orao orar orba orbb orbo oro- oror orra orro raab raba rabb rabo raha rahr raob raoh rara rarb raro rbbb rbbr rboh rhoa rhob rhoh roab roar rob- roba robb robo roha rohr roob roor rora roro rrah rrrr