bbbb bbci bbdd bbdo bcbc bccc bcci bdbc bddc bdii bibb bibi bibo bicc bici bick bico bidi bido biko bio- bioc bioi bobb bobi bobo bock boco bodb bodi bodo boi- boid boii boki boko boob booc bood book c-bo c-cd cbbc cbcc cbdb cbdc cbdi cbdo cbid cbko ccbc cccb cccc ccci ccdc ccdi ccic ccid ccii ccob ccoc ccod cddb cdic cdii cdio cibc cibi cibo cicc cici cico cidc cidi ciid ciii ciko ciob ckbc ckbi ckck ckco ckdo ckob ckoc ckoi ckoo cobb cobi cobo cock coco codd codi cok- coko coob cood cook d-bo dbcc dcbc dccb dccc dcci dcdb dcii dcio dddd ddoc dibb dibo dici dick dico didi dido diii diki diko dioc dkdc dkid dobb dobi doci dock doco dod- dodd dodi dodo doid doki doko doob dood dook ibdo ibid icbc icbd iccb iccc icci icco icdc icdd icoc icod iddo idic idid idio idoc iicd iiii iiio iioi iioo ikid ikki ikko ikoo iobi ioci iod- iodd iodo ioii ioio ioko iooi iooo k-ci k-id kbbb kbbc kbbd kbbi kbbk kbbo kbcb kbci kbck kbco kbdb kbdi kbdo kbib kbic kbid kbik kbio kbkb kbkk kbko kbob kboc kbod kboi kbok kboo kcbc kcbd kcbi kcbk kccb kccc kccd kcci kcck kcdc kcdd kcdi kcic kcid kcii kckc kckk kcko kcob kdbb kdbi kdcc kdcd kdco kddb kddc kddd kddi kddk kdic kdio kdkb kdkd kdkk kdko kdoc kdok kibb kibc kibi kibo kicb kicc kicd kick kidb kidd kidi kidk kido kiic kiid kiii kiik kikc kikd kiki kikk kiko kioc kiod kioi kiok kioo kkbb kkbd kkbi kkbo kkcb kkcd kkci kkck kkco kkdc kkdd kkdo kkic kkid kkik kkkk kkob kkoo kobb kobc kobi kobk kobo kocb kocd koci kock kodi kodk kodo koii kokb kokc koki kokk koko koob kooc kooi kook kooo obbo obid obkb oboi obok ocbc occc occi odbo odci oddd oddi odic odio odoo oici oick oido oiii oiko okic okko okok oobi oodi ooid oooo