bbbb bbci bbeb bbfc bbrc bcbc bccc bcci bcec bcer bcfc bcie bebb bebe bebi beci beck beeb beef beek beer befe beff beic beik beir beke beki berc bere beri berk berr bibb bibe bibi bicc bice bici bick bieb bief bier biff bifi bike birb bire biri birk birr brcb brce breb brec bree bref brei brek brer brfc bric brie brik brkb brrr cbbc cbcc cbce cbcr cbec cbee cbef cber cbfb cbfc cbir cbkr cbre ccbc cccb cccc cccf ccci ccee ccfc ccff ccfi ccic ccii ccir ccrc ccre ccrf ccri cec- cece ceci ceeb ceec cef- cefc ceke cer- cerc cere cerf ceri cfbc cfbr cfcb cfcf cffb cffr cfrb cfre cibc cibe cibi cicc cici cicr ciee cier cife ciff ciii cikr cirb circ cire ciri cirk cirr ckbc ckbe ckbi ckck cker ckfi ckfr ckrc crbc crcc crce crcr cre- creb crec cree crei crfc crib cric crie crif crik crkc ebbc ebbr ebcc eber ebfc ebic ecbc ecbe eccb eccc ecce ecci ecef ecfc ecfr ecib ecrc ecrf ecri ecrr eeee eefe eeke eerc efbr effi efic efik efke eick eiec eiei eier eike eiki eire ekeb ekek eker ekfc ekki erbb erbe ercc erce ereb erec erei erer erfc eric erie erik erke erki errc erre f--k fccf fcic fcii fece feck feeb feek feer fefc fefe feff fefi feie feir feke ferb ferc fere ferk ferr ffcc ffee ffff ffii ffrr fibe ficc fice fick fiec fief fier fifc fife fiff fifi fiii fike fiki fire firk frbc frcc free frei frfc frib fric frie frik i-be ibec ibfi ibie ibrc ibri icbc iccb iccc iccf icci iccr icec icee icef icer icfb icke icrc icre icrf icrr iecc ieie iere ieri ifbb ifer ific ifrb ifrf ifri iiie iiii iirc ikee iker ikki ikri irbe ircc iree irer irfe iri- iric irie irki irrc irre irri k-ci kbbb kbbc kbbe kbbf kbbi kbbk kbbr kbcb kbce kbci kbck kbcr kbeb kbec kbee kbef kbek kber kbfb kbfc kbff kbfi kbfk kbfr kbib kbic kbie kbif kbik kbkb kbkf kbkk kbkr kbrb kbrc kbre kbrf kbri kbrk kcbc kcbf kcbi kcbk kcbr kccb kccc kcci kcck kccr kceb kcec kcee kcei kcfb kcfc kcfi kcic kcie kcif kcii kcir kckc kckf kckk kckr kcrc kcri kcrr kebb kebc kebe kebi kebr keck kecr keef keek keer kefb kefc keff kefr keib keif keii keik keir kekb kekc keke keki ker- kerb kerc kere kerf keri kerk kerr kfbc kfbk kfcf kfcr kfeb kfer kffb kfff kffk kfir kfkb kfrc kfre kfri kfrr kibb kibc kibe kibi kibr kicb kicc kice kick kicr kief kier kife kiff kifr kiic kiii kiik kikc kikf kiki kikk kikr kirb kirc kirf kiri kirk kirr kkbb kkbe kkbi kkbr kkcb kkci kkck kkcr kkfi kkfr kkic kkik kkkk kkrb kkrc kkre kkrf kkrk kkrr krbb krbe krbi krbk krbr krcb krcc krce krci kreb krec kree kref krei krek krfc krfe krff krib krik krkc krke krki krkk krkr krrb krrc krre krrf krri krrk krrr rbbb rbbr rcbc rccb rccc rcfc rcic rebb rebe rebk recc rece reci reck recr reeb reef reek refe reff refi refr reif reii reik reir reke reki rere reri rfef rffc rfic rib- ribe ricc rice rick rief riek rier rife riff riif rike riki rikk rire riri rkkf rrfc rrif rrrr