a-ak a-be aaaa aaab aaae aaaf aaar aaba aabb aaea aafa aafb aaff aage aaka aake aara aare abaa abab abae abaf abag abak abar abb- abba abbb abbe abbr abee aber abff abra aeaf aeer aega aeka aer- aera afaa afak afar afee afek afer affa afgf afka afkr afr- afra afre agag agar agba agea agee ager agfa agga agge agra agre akaa akae akar akee akeg aker akka akr- akra akre arab arae araf arag arak arar arba arbe area aree aref areg arek arfa arfb arff arga argb arge arka arke arr- arra arre arrg arrk arrr baaa baaf baak baar baba babb babe babr baek baer baff baga bage bagg bak- baka bake bakr bar- bara barb bare barf barg bark barr bbbb bbeb bbga bbrg beaf beag beak bear beba bebb bebe beeb beef beeg beek beer befa befe beff bega begg beka beke bera bere berg berk berr bfgf brab brae braf brag brak brea breb bree bref breg brek brer brka brkb brrr eaaf eaba eafb eaga eage eara earb eare ebba ebbr eber eeea eeee eefa eefe eega eeka eeke eera eerg ef-g efab efbr effa efke egaa egae egar egba egbe egea egee eger egfr eggb egge egra egre eka- ekab ekeb ekek eker ekka eraf erba erbb erbe ereb erer erg- erga ergg erke erra erre f--k faaa faba fabe faeb fafa fafe faff fafg fage fagg fake fara farb fare farg fark farr fbar feaf feak fear feba feeb feek feer fefe feff fege fegg feke fera ferb fere ferk ferr ffar ffee ffff ffrr fkab frab frae frag frak frea free gaar gaba gabb gabe gabr gaea gaer gafa gafb gaff gaga gage gagg gara garb gare garf garg garr gbag geab gear geba gebe geek geer gefe gege gegg gera gerb gere gfer gffa ggfg gggg grab grae graf grbr grea greb gree gref greg grfa grrr kaaa kaab kaaf kaag kaak kaar kaba kabb kabe kabf kabg kabr kaer kafa kafe kaff kafr kag- kaga kagb kage kagg kagr kaka kake kakk kara karb kare karf karg kark karr kbaa kbab kbae kbak kbar kbba kbbb kbbe kbbf kbbg kbbk kbbr kbeb kbee kbef kbek kber kbfb kbff kbfk kbfr kbga kbgb kbge kbgg kbgr kbkb kbkf kbkg kbkk kbkr kbra kbrb kbre kbrf kbrg kbrk kea- keag keak kear keba kebb kebe kebr keef keek keer kefa kefb keff kefr kega kege kegg kegk kegr keka kekb keke ker- kera kerb kere kerf kerk kerr kfab kfar kfbk kfeb kfeg kfer kffa kffb kfff kffg kffk kfge kfgr kfka kfkb kfra kfre kfrg kfrr kgab kgaf kgak kgba kgbb kgbr kgeb kgfa kgff kgfk kgga kggf kggg kggr kgra kgrb kgre kgrg kgrk kgrr kkaa kkag kkar kkba kkbb kkbe kkbg kkbr kkea kkeg kkfg kkfr kkgb kkgr kkkk kkrb kkre kkrf kkrk kkrr krab krae krag krak krar krba krbb krbe krbg krbk krbr krea kreb kree kref krek krfe krff krfg krka krke krkk krkr krrb krre krrf krrg krrk krrr raab raaf raag raak raba rabb rabe rabk raef raeg raer rafa rafe raff raga rage ragg raka rake rakk rara rarb rare rarf rark rbaf rbbb rbbr rea- reae reaf reak rear reba rebb rebe rebk reeb reef reek refe reff refg refr rega rege regr reka reke rera rere rerg rfae rfef rgba rgbe rkkf rrrr