bbbb bbbs bbdd bd-r bdii bdry bdsd bibb bibi bibs bidi bidr bids biis birb bird biri birr birs biry bis- bisd biss bisy biys brds brdy brid bris brrr brrs brsb brsr bry- bryd bsbd bsrd bssd byrd bysb bysi byss bysy byyd dbrs dbss dddd ddry ddss dibb dibs diby didi dids didy diii diis dird dirr dirs dis- disd disi diss disy diyi drib drrs dry- drys dsdr dsri dsrr dssi dydd dyr- dyrb dyri dys- dysi dysr dyss dyyr i-by ibid ibis ibrd ibri ibss ibyi idid idir idis idss iiii iiis iirs iisd iisi iisr irby irds iri- irid iris iriy irri irrs isbd isdb isds isis isri issi issr isss issy isys rbbb rbbr rbbs rbds rbis rbsd rbss rib- ribs riby ridd ridi rids riis riri rirs risd risi riss rrrr rsbi rsdd rsds rsid rsis rydy ryis rysy s-ib s-ii sbbs sbds sbsd sbsi sdds sdib sdrs sdry sdss sibi sibs siby sidd sidi sidr sids sidy siri sirr sirs sisd sisi siss sisy siyi srby srib sris srsd ssbr ssby ssdd ssid ssis ssri ssrs sssb sssi ssss sydi syds syis syrs syry syss ybbs ybry yidi yids yirb yird yirr yiss ysby ysii ysyb yyyy