a-be aaaa aaab aaae aaap aaar aaba aabb aabp aaea aaep aapa aara aare aarp abaa abab abae abaj abap abar abb- abba abbb abbe abbr abee aber abpa abpp abpr abra aeap aeer aer- aera ajab ajar ajba ajee ajep ajpa apap apar apba apbr apea apep aper appa appr apra apre arab arae arap arar arba arbe area aree arep arja arje arpa arpe arr- arra arre arrr baaa baar baba babb babe babr baer baja bapa bape bapp bar- bara barb bare barr bbbb bbeb bbpr beap bear beba bebb bebe beeb beej beep beer beja bera bere berr bpea brab brae braj brea breb bree brep brer brje brrr eaba eapp eara earb eare earp ebba ebbr eber eeea eeee eera ejer epaa epee eper eppa eppp epra eprb eprp erap erba erbb erbe ereb erer erja erpa erpe erra erre jaap jaar jaba jabr jaer jaja japa jape japp jara jare jarp jarr jbaa jbar jear jebb jebe jeep jeer jera jere jjap jjar jrbr paap paar paba paea paep paer paja paje papa papb pape papp papr par- para pare parp parr pbar pbpa peab peap pear peba peep peer peja peje pepa pepe per- pera pere perp perr ppap ppar pper pppa pppp prae praj prar pre- preb pree prep raab raaj raba rabb rabe raep raer raja raje rapa rape rapp rara rarb rare rbbb rbbr rbpj rea- reae reap rear reba rebb rebe reeb reep reja repe repp repr rera rere rrrr