bbbb bbdd bbdo bd-r bdii bibb bibi bibo bidi bido bidr biko bio- bioi birb bird biri birk biro birr bobb bobi bobo bodb bodi bodo boi- boid boii boki boko boob bood book boor bor- bord bori bork boro borr brdo brid brik brio brkb brob brod brok broo bror brrr d-bo dddd dibb dibo didi dido diii diki diko dior dird dirk dirr dkid dobb dobi dod- dodd dodi dodo doid doki doko doob dood dook door dord dori dork doro dorr drib drob drod ibdo ibid ibrd ibri ibro iddo idid idio idir idro iiii iiio iioi iioo ikid ikki ikko ikoo ikri iobi iod- iodd iodo ioii ioio ioko iooi iooo iori irdo iri- irid irio irki irob irod irri k-id kbbb kbbd kbbi kbbk kbbo kbbr kbdb kbdi kbdo kbdr kbib kbid kbik kbio kbkb kbkk kbko kbkr kbob kbod kboi kbok kboo kbrb kbrd kbri kbrk kbro kdbb kdbi kdbr kddb kddd kddi kddk kddr kdio kdkb kdkd kdkk kdko kdkr kdok kdrb kdri kdro kibb kibi kibo kibr kidb kidd kidi kidk kido kidr kiid kiii kiik kikd kiki kikk kiko kikr kiod kioi kiok kioo kirb kiri kirk kiro kirr kkbb kkbd kkbi kkbo kkbr kkdd kkdo kkid kkik kkkk kkob kkoo kkor kkrb kkrk kkro kkrr kobb kobi kobk kobo kobr kodi kodk kodo koii koir kokb koki kokk koko kokr koob kooi kook kooo koor korb kord kori kork koro korr krbb krbd krbi krbk krbr krdd krdo krdr krib krid krik krio krkd krki krkk krko krkr krob krod kroi krok kroo kror krrb krri krrk krro krrr obbo obid obkb oboi obok obor obri obro odbo oddd oddi odio odir odoo odor oido oiii oiko okir okko okok okor okro oobi oodi ooid oooo oord orbb orbi orbo ordo ori- orid orio orko oro- orok oror orri orro rbbb rbbr rdio rib- ribo ridd ridi rido riki rikk riri rob- robb robi robo rodd rodi rodo roid roik roio roir roki rokk roko rokr roob rood rooi rook roor rori rork roro rrrr