bbbb bbeb bbet bebb bebe bebi beeb beef beer beet befe beff beft beir beit bere beri berr bert bete beti bett bftt bibb bibe bibi bieb bief bier biet biff bifi birb bire biri birr birt bite bitt breb bree bref brei brer bret brie brit brrr btie btrt bttb ebbr eber ebit eeee eefe eete efbr efet effi efit eft- eiei eier eire eitb eiti eitr erbb erbe ereb erei erer eret erft erie erit erre etbr etee eter etfb etfe etre ette etti feeb feer feet fefe feff fefi feie feir feit ferb fere ferr fert fete feti fetr fett ffee ffff ffii ffrr fftf fibe fief fier fife fiff fifi fift fiii fire fite fiti fitt free frei fret frib frie frit fter ftii i-be ibet ibfi ibie ibri ibtb ieet ieie iere ieri ietf iett ifbb ifer ifit ifrb ifrf ifri iiie iiii iiit iitr iitt irbe iree irer irfe iri- irie irre irri irte irtf irti itbe iter itet itie itif itrf itri ittf rbbb rbbr rebb rebe reeb reef reet refe reff refi refr reft reif reii reir reit rere reri rert rete reti retr rett rfef rib- ribe rief rier riet rife riff rift riif rire riri rite riti ritt rrif rrrr rtbf rtee rtei rtfb tbit tbrb teef teer teet teff tefi teft teie teir ter- tere terf teri terr tete teti tetr tett tfeb tibi tie- tiee tief tiei tier tiet tiff tift tiit tirb tire tiri tirr tite titi titt tre- tree tref trei tret trfr tri- trib trie trif trit trte trtr ttbb tter ttff tttt