a-ha aaaa aaab aaah aaar aaav aaba aabb aabh aaha aaoo aara aaro aava abaa abab abar abb- abba abbb abbo abbr abha abho abhr aboa abob aboh aboo abor abov abra abro abva ahab ahah ahar ahha ahoa ahor ahra ahrr ahva aoah aoba aora aorb arab arah arar arba arbh arh- aroa arob aroo aror arr- arra arrh arro arrr arva arvo avab avao avar avor avra avro avva avvo baaa baah baar baba babb babo babr baha baho bahr baoh bar- bara barb barh baro barr bava bbbb bhao bhar bhor bhra boab boar boba bobb bobo boha boho bohr boob booh boor bor- bora borh boro borr bova bovo brab brah brao brav broa brob broh broo bror brrr haab haar haba habo haha haho haor hara harh haro harr harv hava hbar hhaa hhhh hoar hoba hobo hoha hoho hoor hora horo horr hova hrob hvar oara obba obbo obor obra obrh obro ohba ohho ohob ohoh ohra ooaa ooba ooha ooho oooh oooo oora orab orah orao orar orav orba orbb orbo oro- oror orra orro orvr ovar ovo- ovoo ovra raab raba rabb rabo raha rahr raob raoh rara rarb raro rava rbbb rbbr rboh rhoa rhob rhoh roab roar rob- roba robb robo roha rohr roob roor rora roro rova rovo rrah rrrr rvvh vaar vaho vara varr vava vhhh voar voho voor vor- vora voro vrav vrba vvob vvvv