a-be aaaa aaab aaad aaae aaaf aaar aaba aabb aabd aada aade aaea aafa aafb aafd aaff aara aard aare abaa abab abad abae abaf abar abb- abba abbb abbe abbr abda abed abee aber abff abra adaa adab adad adae adar adba adda addd adde addr adea adeb adee ader adfa adra adre aeaf aede aeer aer- aera aerd afaa afad afar afdb afee afer affa afr- afra afre arab arad arae araf arar arba arbe arda arde ardf area ared aree aref arfa arfb arff arr- arra arre arrr baaa baad baaf baar baba babb babe babr bada badb badd bade badr baed baer baff bar- bara barb bard bare barf barr bbad bbbb bbdd bbeb bd-r bead beaf bear beba bebb bebe beda bede beeb beed beef beer befa befe beff bera berd bere berr brab brad brae braf brda brea breb bred bree bref brer brrr daab daad daae daar daba dabb dada dade daeb daer dafa dafe daff dara darb dard dare darf darr dbar dddd ddre dead deae deaf dear deba debe deda dedd dede deeb deed deef deer defe deff der- dera derb dere derf derr dfaf dfer dffa dfrf draa drab drad draf drar drba drda drea dred dree dref drra eaaf eaba eada eadb eadd eafb eara earb eard eare ebba ebbr ebed eber edad edar edda edde ede- edea eder edfa edra eede eeea eeee eefa eefe eera efab efbr efda effa erad eraf erba erbb erbe erda erde erdf ereb ered erer erra erre faaa faad faba fabd fabe fada fadd fade faeb fafa fafe faff fara farb fard fare farr fbar fead feaf fear feba feda fede feeb feed feer fefe feff fera ferb ferd fere ferr ffar ffee ffff ffrr frab frad frae frea fred free raab raad raaf raba rabb rabe rada radd rade radr raed raef raer rafa rafe raff rara rarb rare rarf rbaf rbbb rbbr rder rdfa rea- read reae reaf rear reba rebb rebe reda redd rede redr reeb reed reef refd refe reff refr rera rerd rere rfae rfef rrad rred rrrr