bbbb bbbs bbin bibb bibi bibs biin biis bin- bini binn bins biny birb biri birn birr birs biry bis- biss bisy biys bnib bnin bnrr bnss brin bris brns brrr brrs brsb brsr bry- bryn bsin bsns byrn bysb bysi byss bysy i-by ibis ibns ibri ibsn ibss ibyi iiii iiis iirs iisi iisr inby inis inni innr inns inny inri inrs inss irby iri- irin iris iriy irri irrs iryn isbn isin isis isri issi issr isss issy isys n-ii nibi nibs niir nini nins nirs nisi niss niyi nnnn nnss nsin nsis nsnr nssb nssr nsss nyny nyrb nyss rbbb rbbr rbbs rbis rbss rib- ribs riby riin riis rinn riny riri rirs risi riss rnbr rnin rrrr rsbi rsis rsnn rsnr ryis rynn rysy s-ib s-ii sbbs sbsi sibi sibs siby sini sinn sins siny siri sirr sirs sisi siss sisy siyi snib snir snns snrs snsy snys srby srib sris srni srnn ssbn ssbr ssby ssin ssis ssns ssri ssrs sssb sssi ssss syis syn- syns syny syrs syry syss ybbs ybry yins yirb yirn yirr yiss yrin yryn ysby ysii ysyb yyyy