bbbb bbci bbrc bcbc bccc bcci bcor bibb bibi bibo bicc bici bick bico biko bio- bioc bioi birb biri birk biro birr bobb bobi bobo bock boco boi- boii boki boko boob booc book boor bor- bori bork boro borr brcb bric brik brio brkb brob broc brok broo bror brrr c-bo cbbc cbcc cbcr cbir cbko cbkr ccbc cccb cccc ccci ccic ccii ccir ccob ccoc ccrc ccri cibc cibi cibo cicc cici cico cicr ciii ciko cikr ciob cior cirb circ ciri cirk ciro cirr ckbc ckbi ckck ckco ckob ckoc ckoi ckoo ckor ckrc cobb cobi cobo cock coco coir cok- coko coob cook cor- corb corc cori cork coro corr crbc crcc crcr crib cric crik crkc crob croc crok croo cror ibrc ibri ibro icbc iccb iccc icci icco iccr icoc icor icrc icrr iiii iiio iioi iioo iirc ikki ikko ikoo ikri iobi ioci ioii ioio ioko iooi iooo iori ircc iri- iric irio irki irob iroc irrc irri k-ci kbbb kbbc kbbi kbbk kbbo kbbr kbcb kbci kbck kbco kbcr kbib kbic kbik kbio kbkb kbkk kbko kbkr kbob kboc kboi kbok kboo kbrb kbrc kbri kbrk kbro kcbc kcbi kcbk kcbr kccb kccc kcci kcck kccr kcic kcii kcir kckc kckk kcko kckr kcob kcor kcrc kcri kcro kcrr kibb kibc kibi kibo kibr kicb kicc kick kicr kiic kiii kiik kikc kiki kikk kiko kikr kioc kioi kiok kioo kirb kirc kiri kirk kiro kirr kkbb kkbi kkbo kkbr kkcb kkci kkck kkco kkcr kkic kkik kkkk kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kobb kobc kobi kobk kobo kobr kocb koci kock koii koir kokb kokc koki kokk koko kokr koob kooc kooi kook kooo koor korb korc kori kork koro korr krbb krbi krbk krbr krcb krcc krci krco krib krik krio krkc krki krkk krko krkr krob kroc kroi krok kroo kror krrb krrc krri krrk krro krrr obbo obkb oboi obok obor obri obro ocbc occc occi ocro ocrr oici oick oiii oiko okic okir okko okok okor okro oobi oocr oooo orbb orbi orbo orci orco ori- oric orio orko oro- orok oror orri orro rbbb rbbr rcbc rcbo rccb rccc rcic rib- ribo ricc rick rico riki rikk riri rob- robb robi robo rocc rock roco roik roio roir roki rokk roko rokr roob rooi rook roor rorc rori rork roro rrrr