bbbb bbci bbfc bbox bbrc bcbc bccc bcci bcfc bcof bcor bibb bibi bibo bicc bici bico biff bifi bio- bioc bioi biox birb biri biro birr birx bixi bobb bobi bobo boco boff boi- boii boob booc boof boor boox bor- borf bori boro borr brcb brfc bric brio brix brob broc broo bror brox brrr c-bo cbbc cbcc cbcr cbfb cbfc cbir cbox ccbc cccb cccc cccf ccci ccfc ccff ccfi ccic ccii ccir ccix ccob ccoc ccrc ccrf ccri ccxi cfbc cfbr cfcb cfcf cfco cffb cffr cfix cfor cfox cfrb cfrx cibc cibi cibo cicc cici cico cicr ciff ciii ciob cior cirb circ ciri ciro cirr cixi cobb cobi cobo coco cofc coff cofi coif coir coix coob coof cor- corb corc corf cori coro corr crbc crcc crcr crfc crib cric crif crob croc croo cror cxii cxix cxro cxxi cxxx fccf fcic fcii ffcc ffff ffii ffrr ficc fico fifc fiff fifi fifo fiii fior fixx foci foco fofo foix foof for- forb fori foro forr foxx frbc frcc frfc frib fric frio frob ibfi ibox ibrc ibri ibro icbc iccb iccc iccf icci icco iccr icfb icoc icor icrc icrf icrr ifbb ifco ific ifor ifrb ifrf ifri iiii iiio iioi iioo iirc iobi ioci iofc ioii ioio ioof iooi iooo iori ircc ircx iri- iric irio irix irob iroc irrc irri ixxi obbo obix oboi obor obox obri obro ocbc occc occi ocro ocrr ofcr off- offc offo offr ofor oici oiii oobi oocr ooff oooo orbb orbi orbo orci orco orff orfi ori- oric orif orio orix oro- orof oror orri orro oxi- oxic oxo- oxof oxox oxxo rbbb rbbr rcbc rcbo rccb rccc rcfc rcic rffc rfic rib- ribo ricc rico riff riif riri rixc rixo rob- robb robi robo rocc roco rofc roff rofo roif roio roir roob roof rooi roor roox rorc rori roro roxo rrfc rrif rrrr x-fi xbox xcii xcri xibo xico xiii xixi xobc xoco xoro xoxo xxii xxix xxxi xxxo xxxx