a-be aaaa aaab aaae aaaf aaap aaar aaba aabb aabp aaea aaep aafa aafb aaff aaoe aaoo aapa aapo aara aare aaro aarp abaa abab abae abaf abap abar abb- abba abbb abbe abbo abbr abee aber abff aboa abob abof aboo abor abpa abpp abpr abra abro aeaf aeap aeer aer- aera aero afaa afao afap afar afee afer affa affo afoa afoe afoo afor afpa afpe afr- afra afre afro aoba aopo aora aorb apao apap apar apba apbr apea apep aper apfa apfo apo- apoe apof apoo apop apor appa appr apra apre apro arab arae araf arap arar arba arbe area aree aref areo arep arfa arfb arff aroa arob aroe aroo aror arpa arpe arr- arra arre arro arrr baaa baaf baar baba babb babe babo babr baer baff bafo bapa bape bapp bar- bara barb bare barf baro barr bbbb bbeb bbpr beaf beap bear beba bebb bebe bebo beeb beef beep beer befa befe beff befo beo- beof beor bepo bera bere bero berr bfpo bfpp boab boar boba bobb bobe bobo boea boee boef boeo boep boer bofa bofe boff boob booe boof boop boor bopa bope bopp bor- bora bore borf boro borr bpea bpoe brab brae braf brao brea breb bree bref breo brep brer broa brob broe broo bror brrr eaaf eaba eafb eaop eapp eara earb eare earo earp ebba ebbo ebbr eber eboe eboo ebor ebpo ebro eeea eeee eefa eefe eera eero efab efbr efeo effa efor efpa eora eore epaa epee eper epfa epor eppa eppo eppp epra eprb epro eprp eraf erap erba erbb erbe ereb erer erob eroe eroo erpa erpe erra erre erro faaa faap faba fabe fabo faeb fafa fafe faff fafo fapa fape fapp fara farb fare faro farp farr fbar fbop feaf feap fear feba febo feeb feer fefe feff fefo feof fepa fera ferb fere fero ferr ffar ffee ffff ffrr foaf foar foba foer fofo foof fopp for- fora forb fore foro forr fpaa fpra fprf frab frae frap frea free freo frep frob froe frop o-eo oaer oafo oara oare obba obbo obea ober oboe obor obra obre obro oepa oera oere ofer off- offa offe offo offr ofor ofra ofre ooaa ooba oobe ooer ooff oooo oora oore opap opar opep oper opo- opor oppa oppo opra orab orae orao orar orba orbb orbe orbo ore- orea oreb oreo orer orfe orff oro- oroe orof oror orpe orra orro paap paar paba paea paep paer pafa pafe paff papa papb pape papp papr par- para pare parf paro parp parr pbar pbpa pbrf peab peap pear peba peep peer peff peor pepa pepe pepo per- pera pere perf pero perp perr pfaa pfff pffr pfra poar poba pobo poea poer poff poof poop poor pop- popa pope popo popp pora porb pore poro porr ppap ppar pper ppfa ppoa pppa pppo pppp pprf prae prao prar pre- preb pree pref prep pro- proa prob proe prof proo prop raab raaf raba rabb rabe rabo raef raep raer rafa rafe raff raob raop rapa rape rapp rara rarb rare rarf raro rbaf rbbb rbbr rea- reae reaf reao reap rear reba rebb rebe rebo reeb reef reep refe reff refr reof reop repe repo repp repr rera rere rero rfae rfef roab roaf roap roar rob- roba robb robe robo roea roer rofe roff rofo roob roof roop roor ropa rope ropo rora rore roro rpob rpoe rpof rrrr