a-do a-fu aaaa aaad aaaf aaar aada aadu aafa aafd aaff aaoo aara aard aaro aaru adaa adad adao adar adda addd addo addr addu adfa adod adoo ador adra adro adua adur afaa afad afao afar affa affo afoa afoo afor afr- afra afro afru afua afud aora aouf arad araf arar arau arda ardf ardo ardu arfa arff arfu aroa arod aroo aror arr- arra arro arrr arru arua arud auaa audo aur- aura aurd auro daad daar daau dada dado dadu dafa daff dafo daou dara dard darf daro darr daru daud daur dddd dfaf dffa dfrf doar dod- doda dodd dodo doff dood doof door dora dord dorf doro dorr doru doud douf dour draa drad draf drar drau drda drod drof drou drra drua druu duaa duad duar duda dudd dudo dudu duff dufu duo- dura duro duru duur faaa faad fada fadd fado fafa faff fafo fara fard faro farr faru faud faur fdoa ffar ffff ffrr foad foaf foar foda fofo food foof for- fora ford foro forr foua foud four frad frau frou fuad fuar fuda fudd fuff fufu fuor fur- fura furo furr oaau oafo oara odda oddd odoo odor odou odra odur ofdr off- offa offo offr offu ofor ofra ooaa ooda ooff oooo oora oord orad orao orar orda ordo ordu orff orfu oro- orof oror orra orro ouad ouff our- oura ouro ouu- raad raaf rada radd rado radr radu rafa raff rara rarf raro raua raud rauf rdfa road roaf roar roda rodd rodo roff rofo rood roof roor rora roro roru roua roud rouf rrad rrrr ruad ruda rudd rudo rufa ruff rufo rura rurd ruro ruru ruud uafa uaru uaua udaa udad udar udau udoo udra uffa ufra uofa uofo uor- urad urao urau urda urdu urfa urff uro- uroa uroo urra urur uuuu