bbbb bbdd bbdo bd-r bdii bibb bibi bibo bidi bido bidr biko bio- bioi biot birb bird biri birk biro birr birt bitd bito bitt bobb bobi bobo bodb bodi bodo boi- boid boii boit boki boko boob bood book boor boot bor- bord bori bork boro borr bort botb botd boti boto bott brdo brdt brid brik brio brit brkb brob brod brok broo bror brot brrr btdt btob btor btrt bttb d-bo dbit dbtt dddd ddot dibb dibo didi dido diii diki diko dior diot dird dirk dirr dirt diti dito ditt dkid dobb dobi dod- dodd dodi dodo doid doit doki doko doob dood dook door doot dord dori dork doro dorr dort dotd doti dotk doto dott drib drit drob drod drot dtki dtor dtot ibdo ibid ibot ibrd ibri ibro ibtb iddo idid idio idir idro iiii iiio iiit iioi iioo iitr iitt ikid ikki ikko ikoo ikri iobi iod- iodd iodo ioii ioio ioit ioko iooi iooo iori ioto irdo iri- irid irio irki irob irod irri irti itdo itko itoi itoo itor itri itto k-id kbbb kbbd kbbi kbbk kbbo kbbr kbbt kbdb kbdi kbdo kbdr kbib kbid kbik kbio kbit kbkb kbkk kbko kbkr kbob kbod kboi kbok kboo kbot kbrb kbrd kbri kbrk kbro kbrt kbtb kbtk kbto kbtr kbtt kdbb kdbi kdbr kddb kddd kddi kddk kddr kdio kdkb kdkd kdkk kdko kdkr kdkt kdok kdot kdrb kdri kdro kdtd kdti kdtr kibb kibi kibo kibr kibt kidb kidd kidi kidk kido kidr kiid kiii kiik kiit kikd kiki kikk kiko kikr kikt kiod kioi kiok kioo kiot kirb kiri kirk kiro kirr kirt kiti kito kitr kitt kkbb kkbd kkbi kkbo kkbr kkbt kkdd kkdo kkdt kkid kkik kkit kkkk kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrt kktk kobb kobi kobk kobo kobr kodi kodk kodo kodt koii koir koit kokb koki kokk koko kokr koob kooi kook kooo koor koot korb kord kori kork koro korr kort kotb kotd koti kotk koto kotr kott krbb krbd krbi krbk krbr krbt krdd krdo krdr krib krid krik krio krit krkd krki krkk krko krkr krob krod kroi krok kroo kror krrb krri krrk krro krrr krrt krti krtk krto krtr ktbb ktbr ktbt ktdb ktdd ktdk ktdo ktdr ktib ktik ktkb ktkk ktko ktkr ktkt ktob ktok ktoo ktor ktot ktrb ktri ktrk ktro ktrr ktrt ktti kttk ktto kttr kttt obbo obdt obid obit obkb oboi obok obor obot obri obro obtd odbo oddd oddi odio odir odoo odor odot oido oiii oiko oirt oiti okir okko okok okor okot okro okto oobi oodi ooid oooo oord oort ootb orbb orbi orbo ordo ori- orid orio orit orko oro- orok oror orot orri orro orto otbd otit oto- otok otoo otor otro otti otto rbbb rbbr rdio rib- ribo ridd ridi rido riki rikk riot riri riti rito ritt rob- robb robi robo robt rodd rodi rodo roid roik roio roir roit roki rokk roko rokr roob rood rooi rook roor root rori rork roro rort roti rotk roto rotr rott rrrr rtdt tbit tbrb tddb tdkr tdor tdri tibi tidd tiit tiki tiko tirb tird tiri tiro tirr titi tito titt tkod tobi tobo tobt todd todi todo todt toid toit toki toko tood took toor toot tord tori tork toro torr tort totd toti toto totr tott tri- trib trik trio trit trod troi troo trot trtr ttbb tttt