bbbb bbbs bbdd bblb bbls bd-r bdii bdls bdsd bibb bibi bibl bibs bidi bidr bids bidu biis bild bili bill bils bilu birb bird biri birl birr birs biru bis- bisd bisl biss bisu bldr blir blis blls blss blub blud blur blus brds brid bril bris brls brrr brrs brsb brsr brud brus bsbd bsdl bsrd bssd bubb bubi bubs bubu budb budd budi budl buds budu buid buir buis buiu bulb buld buli bull buls bulu bur- burb burd buri burl burr burs buru busi buss busu buus dbls dbrs dbss dbus dddd ddss ddub dibb dibs didi dids didu diii diis dili dill dils dird dirl dirr dirs dis- disd disi diss dius dlbd dlib dlii dlil dlis dlrs drib dril drrs drub drui drus druu dsdr dsls dsri dsrr dssi dub- dubb dubs dubu dudd duds dudu duid duil duir duis duli dull dulu duri duru dusi duul duur ibid ibis ibrd ibri ibss ibus idid idil idir idis idli idls idss idub idus iiii iiis iirs iisd iisi iisr iisu ilir ilis ill- illd illi ills ilud ilus irds iri- irid iril iris irlb irri irrs irul irus isbd isbl isdb isds isil isis isls isri issi issr isss issu isus iuds iuiu iusd iuss lbds lblr lbrs ldls ldrs libr libs libu lidb lidl lids liii liir liis lilb lili lill lils lilu lird liri lirl lirr lirs liru lisd lisi liss lisu lius llbs lldb llds llll llud lrdd lrds lrrr ls-r lsbu lsds lsid lssr lubs ludd ludi luis luli lull lulu lurd luri lurs lusi luss rbbb rbbr rbbs rbds rbis rbsd rbsl rbss rib- ribs ribu ridd ridi rids riis rill rilu riri rirs risd risi riss risu rius rlds rlls rrrr rsbi rsdd rsdl rsds rsid rsis rssl rubb rubi rubs rubu rudd rudi rudl ruds ruid ruis rull rurd ruri rurs ruru rusi russ rusu ruud s-ib s-ii sbbs sbds sbsd sbsi sbus sdds sdib sdls sdrs sdsl sdss sdsu sibi sibs sibu sidd sidi sidr sids sil- sild sili sill sils silu siri sirr sirs siru sisd sisi siss sisu siui sius sl-i slds slib slid slir slrs slsu slub slud slur srib sris srsd srub ssbr ssdd ssid ssis ssri ssrl ssrs sssb sssi ssss sub- subb subd subi subl subs sudd sudi suds suid suir suis sul- suld suli sull sulu sur- surd suri surr surs suru sus- susd susi suss susu suus ubbi ubid ubii ubir ubis ubli ubls ubud uddi udds udid udir udsd udsl uirr uisd ulli ullr ulul ulus urbi urbs urds urdu urib uris uriu urls urri ursi urss ursu urur urus usbl usbr usbs usdl usds usis uslu ussb ussr usss ussu usui usul usus uulu uuri uusi uuuu