bbbb bbdd bbdo bd-r bobb bobo bodb bodo boko boob bood book boor boot bor- bord bork boro borr bort botb botd boto bott brdo brdt brkb brob brod brok broo bror brot brrr btdt btob btor btrt bttb d-bo dbtt dddd ddot dobb dod- dodd dodo doko doob dood dook door doot dord dork doro dorr dort dotd dotk doto dott drob drod drot dtor dtot kbbb kbbd kbbk kbbo kbbr kbbt kbdb kbdo kbdr kbkb kbkk kbko kbkr kbob kbod kbok kboo kbot kbrb kbrd kbrk kbro kbrt kbtb kbtk kbto kbtr kbtt kdbb kdbr kddb kddd kddk kddr kdkb kdkd kdkk kdko kdkr kdkt kdok kdot kdrb kdro kdtd kdtr kkbb kkbd kkbo kkbr kkbt kkdd kkdo kkdt kkkk kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrt kktk kobb kobk kobo kobr kodk kodo kodt kokb kokk koko kokr koob kook kooo koor koot korb kord kork koro korr kort kotb kotd kotk koto kotr kott krbb krbd krbk krbr krbt krdd krdo krdr krkd krkk krko krkr krob krod krok kroo kror krrb krrk krro krrr krrt krtk krto krtr ktbb ktbr ktbt ktdb ktdd ktdk ktdo ktdr ktkb ktkk ktko ktkr ktkt ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrt kttk ktto kttr kttt obbo obdt obkb obok obor obot obro obtd odbo oddd odoo odor odot okko okok okor okot okro okto oooo oord oort ootb orbb orbo ordo orko oro- orok oror orot orro orto otbd oto- otok otoo otor otro otto rbbb rbbr rob- robb robo robt rodd rodo rokk roko rokr roob rood rook roor root rork roro rort rotk roto rotr rott rrrr rtdt tbrb tddb tdkr tdor tkod tobo tobt todd todo todt toko tood took toor toot tord tork toro torr tort totd toto totr tott trod troo trot trtr ttbb tttt