bbbb bbbs bbdd bd-r bdii bdsd bibb bibi bibs bidi bidr bids biis birb bird biri birr birs bis- bisd biss bivi brds brid bris brrr brrs brsb brsr brvi bsbd bsrd bssd bvds dbrs dbss dddd ddss dibb dibs didi dids diii diis diiv dird dirr dirs dis- disd disi diss divd divi divs drib drrs dsdr dsri dsrr dssi dsvd dvbs dvdr dvds dvi- dvii dvir dvrs dvsr ibid ibis ibrd ibri ibss idid idir idis idss idvd iiii iiis iirs iisd iisi iisr irds iri- irid iris irri irrs irvs isbd isdb isds isis isri issi issr isss ivbv ivdr ivrs rbbb rbbr rbbs rbds rbis rbsd rbss rdvs rib- ribs ridd ridi rids riis riri rirs risd risi riss rivs rrrr rsbi rsdd rsds rsid rsis s-ib s-ii s-iv sbbs sbds sbsd sbsi sdds sdib sdrs sdss sibi sibs sidd sidi sidr sids siri sirr sirs sisd sisi siss sivi srib sris srsd ssbr ssdd ssid ssis ssri ssrs sssb sssi ssss svir vdsi vibs vidi vids viii virb viri virr visd visi viss vivi vrdi vris vrsi vvsb vvvv