bbbb bbbs bffs bfsi bfsr bibb bibi bibs biff bifi biis birb biri birr birs biry bis- biss bisy biys bris brrr brrs brsb brsr bry- bsff bsfs bysb bysi byss bysy fbis fbrs ffff ffii ffrr ffss fibs fiff fifi fiii firs firy fisi fiss frib fris frsb frys fsfi fssf fyfi fyrs fyry i-by ibfi ibis ibri ibsf ibss ibyi ifbb ifby iffy ifis ifrb ifrf ifri ifsb iiii iiis iirs iisi iisr irby iri- iris iriy irri irrs irsf isis isri issf issi issr isss issy isys rbbb rbbr rbbs rbis rbss rib- ribs riby riff rifs riif riis riri rirs risi riss riyf rrif rrrr rsbi rsis ryff ryif ryis rysy ryyf s-ib s-ii sbbs sbsi sfss sibi sibs siby siff sifr sify sirf siri sirr sirs sisi siss sisy siyi srby srfi srib sris ssbr ssby ssis ssri ssrs sssb sssf sssi ssss syff syfy syis syrs syry syss ybbs ybry yiff yirb yirr yiss ysby ysii ysyb yyff yyyy