bbbb bbbs bbdd bd-r bdii bdsd bibb bibi bibs bidi bidr bids biis birb bird biri birr birs bis- bisd biss brds brid bris brrr brrs brsb brsr bsbd bsrd bssd dbrs dbss dddd ddss dibb dibs didi dids diii diis dird dirr dirs dis- disd disi diss drib drrs dsdr dsri dsrr dssi ibid ibis ibrd ibri ibss idid idir idis idss iiii iiis iirs iisd iisi iisr irds iri- irid iris irri irrs isbd isdb isds isis isri issi issr isss rbbb rbbr rbbs rbds rbis rbsd rbss rib- ribs ridd ridi rids riis riri rirs risd risi riss rrrr rsbi rsdd rsds rsid rsis s-ib s-ii sbbs sbds sbsd sbsi sdds sdib sdrs sdss sibi sibs sidd sidi sidr sids siri sirr sirs sisd sisi siss srib sris srsd ssbr ssdd ssid ssis ssri ssrs sssb sssi ssss