aaaa aaab aaaf aaar aaba aabb aafa aafb aaff aaoo aara aaro abaa abab abaf abag abar abb- abba abbb abbo abbr abff aboa abob abof aboo abor abra abro afaa afao afar affa affo afgf afoa afog afoo afor afr- afra afro ag-o agag agao agar agba agbo agfa agga agob agog agoo agra agro aoba aora aorb arab araf arag arar arba arfa arfb arff arga argb argo aroa arob aroo aror arr- arra arrg arro arrr baaa baaf baar baba babb babo babr baff bafo baga bagg bago bar- bara barb barf barg baro barr bbbb bbga bbrg bfgf boab boag boar boba bobb bobo bofa boff boga bogg bogo boob boof boog boor bor- bora borf borg boro borr brab braf brag brao broa brob brog broo bror brrr faaa faba fabo fafa faff fafg fafo fagg fago fara farb farg faro farr fbar ffar ffff ffrr foaf foar foba fofo fogg fogo foof for- fora forb forg foro forr frab frag frob frog gaar gaba gabb gabo gabr gafa gafb gaff gaga gagg gago gara garb garf garg garo garr gbag gbbo gffa gfoa gfor ggfg gggg goaf goar goba gobo goff gofr goga gogo goof goog goor gora gorb gorf gorg goro gorr grab graf grbr grfa grob grof grog groo gror grrr oafo oara obba obbo obor obra obro off- offa offo offr ofgo ofor ofra ogar ogb ogba ogfr ogoa ogog ogra ogro ooaa ooba ooff oooo oora orab orao orar orba orbb orbo orff orga orgo oro- orof oror orra orro raab raaf raag raba rabb rabo rafa raff raga ragg rago raob rara rarb rarf raro rbaf rbbb rbbr rgba roab roaf roag roar rob- roba robb robo roff rofo roga rogg rogo roob roof roog roor rora roro rrrr