bbbb bbeb bebb bebe bebi beby beeb beef beer beey befe beff beir bere beri berr bery beye beyi bibb bibe bibi bieb bief bier biff bifi birb bire biri birr biry breb bree bref brei brer brey brie brrr bry- brye byer byre ebbr ebby eber eeby eeee eefe eery efbr effi effy eiei eier eire eiry erbb erbe ereb erei erer erie erre erye eyeb eyer eyey eyfi eyir eyre eyry eyyr feeb feer fefe feff fefi feie feir ferb fere ferr fery feyr ffee ffff ffii ffrr fibe fief fier fife fiff fifi fiii fire firy free frei frey frib frie frye fyfe fyfi fyre fyry i-be i-by ibfi ibie ibri ibyi ieie iere ieri ifbb ifby ifer iffy ifrb ifrf ifri iiie iiii irbe irby iree irer irfe iri- irie iriy irre irri iyer iyre rbbb rbbr rebb rebe reeb reef refe reff refi refr reif reii reir rere reri rery reye rfef rib- ribe riby rief rier rife riff riif rire riri riyf rrif rrrr rybe ryeb ryfe ryff ryif ryyf yber ybry yeer yefe yeff yeie yeii yeir yerb yere yeri yerr yery yeye yeyi yeyr yiff yirb yire yirr yyfe yyff yyyy