bbbb bbdd bbdo bd-r bdii bibb bibi bibo bidi bido bidr biko bio- bioi birb bird biri birk biro birr bivi bobb bobi bobo bodb bodi bodo boi- boid boii boki boko boob bood book boor bor- bord bori bork boro borr bovi bovo brdo brid brik brio brkb brob brod brok broo bror brrr brvi d-bo dddd dibb dibo didi dido diii diiv diki diko dior dird dirk dirr divd divi divo dkid dobb dobi dod- dodd dodi dodo doid doki doko doob dood dook door dord dori dork doro dorr dovi drib drob drod dvdr dvi- dvii dvir dvor ibdo ibid ibrd ibri ibro iddo idid idio idir idro idvd 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 irov irri ivbv ivdr ivod ivor k-id kbbb kbbd kbbi kbbk kbbo kbbr kbdb kbdi kbdo kbdr kbdv kbib kbid kbik kbio kbkb kbkk kbko kbkr kbkv kbob kbod kboi kbok kboo kbov kbrb kbrd kbri kbrk kbro kbrv kbvb kbvo kbvr kdbb kdbi kdbr kdbv kddb kddd kddi kddk kddr kdio kdkb kdkd kdkk kdko kdkr kdok kdov kdrb kdri kdro kdrv kdvb kdvi kdvr kdvv 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 kirv kivi kkbb kkbd kkbi kkbo kkbr kkdd kkdo kkdv kkid kkik kkkk kkob kkoo kkor kkov kkrb kkrk kkro kkrr kkrv kkvr kkvv kobb kobi kobk kobo kobr kodi kodk kodo kodv koii koir koiv kokb koki kokk koko kokr koob kooi kook kooo koor koov korb kord kori kork koro korr korv kovi kovk kovo kovr krbb krbd krbi krbk krbr krdd krdo krdr krib krid krik krio kriv krkd krki krkk krko krkr krkv krob krod kroi krok kroo kror krov krrb krri krrk krro krrr krvb krvi krvk krvo krvr krvv kvbr kvik kvir kviv kvob kvod kvoi kvok kvoo kvor kvov kvri kvro kvrr kvrv kvvr kvvv obbo obid obkb oboi obok obor obri obro obvi 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 orvr ovi- ovid ovo- ovod ovoo rbbb rbbr rdio rib- ribo ridd ridi rido riki rikk riri rivo rob- robb robi robo rodd rodi rodo roid roik roio roir roki rokk roko rokr roob rood rooi rook roor rori rork roro rovi rovo rrrr rvik vdio vidi vido viii viik viki viko virb viri virk viro virr vivi vivo vkor vodo void voio voir voor vor- vord vori voro vovk vrdi vrio vvob vvvv