-hou a-ha aaaa aaab aaah aaar aaba aabb aabh aaha aaoo aara aaro aaru abaa abab abar abau abb- abba abbb abbo abbr abha abho abhr aboa abob aboh aboo abor abou abra abro abua ahab ahah ahar ahau ahha ahoa ahor ahra ahrr ahua aoah aoba aora aorb arab arah arar arau arba arbh arh- aroa arob aroo aror arr- arra arrh arro arrr arru arua arub auaa aur- aura auro baaa baah baar baba babb babo babr babu baha baho bahr bahu baoh bar- bara barb barh baro barr baru bau- baur bbau bbbb bhao bhar bhor bhra bhur bhuu boab boar boba bobb bobo bobu boha boho bohr bohu boob booh boor bor- bora borh boro borr boru boua bouh bour brab brah brao brau broa brob broh broo bror brou brrr bruh buar buba bubb bubo bubu buha buho buhr bur- bura burb burh buro burr buru haab haar haba habo habu haha haho haor hara harh haro harr haru hau- hbar hhaa hhhh hoar hoba hobo hoha hoho hoor hora horo horr hour hrob huah huba hubb hubo huhu huor hura huro hurr huru huub oaau oahu oara obba obbo obor obra obrh obro obuh ohau ohba ohho ohob ohoh ohra ooaa ooba ooha ooho oooh oooo oora orab orah orao orar orba orbb orbo orbu oro- oror orra orro orub our- oura ouro ouu- raab raba rabb rabo rabu raha rahr rahu raob raoh rara rarb raro raua raub rbbb rbbr rboh rhau rhoa rhob rhoh roab roar rob- roba robb robo robu roha rohr rohu roob roor rora roro roru roua roub rouh rrah rrrr ruah ruba rubb rubu ruhh ruhr rura ruro ruru uaru uaua ubar ubba ubbo ubra uhoh uhuh uor- urao urau urba urho uro- uroa uroo urra urrh urur uuuu