bbbb bbbs bbdd bblb bbls bd-r bdii bdls bdsd bibb bibi bibl bibs bidi bidr bids biis bild bili bill bils bilt birb bird biri birl birr birs birt bis- bisd bisl biss bist bitd bits bitt blbt bldr blir blis blit blls blss blst blts brds brdt brid bril bris brit brls brrr brrs brsb brsr brst bsbd bsdl bsrd bssd bsts btdt btrt btss bttb dbit dbls dbrs dbss dbtt dddd ddss ddts dibb dibs didi dids diii diis dili dill dils dird dirl dirr dirs dirt dis- disd disi diss dist diti dits ditt dlbd dlib dlii dlil dlis dlit dlrs dlst drib dril drit drrs dsdr dsls dsri dsrr dssi dsst dsts dtrl dtss ibid ibis ibrd ibri ibss ibtb ibtl ibts idid idil idir idis idli idls idss idts iiii iiis iiit iirs iisd iisi iisr iist iitr iitt ilir ilis ilit ill- illd illi ills illt ilts irds iri- irid iril iris irlb irri irrs irti irts isbd isbl isbt isdb isds isil isis isit isls isri issi issr isss istd isti istr ists itbs itil itis itll itri itrs itsi lbds lblr lbrs lbrt ldls ldrs libr libs lidb lidl lids liii liir liis lilb lili lill lils lilt lird liri lirl lirr lirs lirt lisd lisi liss list litb litd liti litl litr lits litt llbs lldb llds llll lrdd lrds lrrr lrst lrts ls-r lsds lsid lssr lsts ltbl ltds ltib ltrs ltsi ltsr lttr rbbb rbbr rbbs rbds rbis rbsd rbsl rbss rbst rib- ribs ridd ridi rids riis rill riri rirs risd risi riss rist riti ritl rits ritt rlds rldt rlls rrrr rsbi rsdd rsdl rsds rsid rsis rssl rsts rtdt rtls rtlt rtss rtts s-ib s-ii sbbs sbds sbsd sbsi sbst sdds sdib sdls sdlt sdrs sdsl sdss sibi sibs sidd sidi sidr sids siit sil- sild sili sill sils silt siri sirr sirs sirt sisd sisi siss sist sit- sitd siti sits sitt sl-i slds slib slid slir slit slrs slst slts srib sris srsd srtr ssbr ssdd ssid ssis ssit sslt ssri ssrl ssrs sssb sssi ssss sstb sstd sstl ssts stbd stbs stds stib stid stil stir stis stit stld stlt strd stri strs stsi stss sttd sttr tbbs tbil tbit tbrb tbst tddb tdil tdis tdls tdri tdss tibi tibs tidd tids tiit tild till tilr tils tilt tirb tird tiri tirl tirr tirs tisb tisi tiss tist titi tits titt tldr tlli tlrs tri- trib tril tris trit trsd trsi trst trtr tsbd tsdb tsid tsis tssi tssr tsst tsts ttbb ttss tttt