bbbb bbdd bblb bd-r bdii bibb bibi bibl bidi bidr bild bili bill bilt birb bird biri birl birr birt bitd bitt blbt bldr blir blit brdt brid bril brit brrr btdt btrt bttb dbit dbtt dddd dibb didi diii dili dill dird dirl dirr dirt diti ditt dlbd dlib dlii dlil dlit drib dril drit dtrl ibid ibrd ibri ibtb ibtl idid idil idir idli iiii iiit iitr iitt ilir ilit ill- illd illi illt iri- irid iril irlb irri irti itil itll itri lblr lbrt libr lidb lidl liii liir lilb lili lill lilt lird liri lirl lirr lirt litb litd liti litl litr litt lldb llll lrdd lrrr ltbl ltib lttr rbbb rbbr rib- ridd ridi rill riri riti ritl ritt rldt rrrr rtdt rtlt tbil tbit tbrb tddb tdil tdri tibi tidd tiit tild till tilr tilt tirb tird tiri tirl tirr titi titt tldr tlli tri- trib tril trit trtr ttbb tttt