bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcor bcos bcrs bcsc bcss bibb bibi bibo bibs bicc bici bico bics biis bio- bioc bioi bios birb biri biro birr birs bis- bisc biso biss bobb bobi bobo bobs boco bocs boi- boii bois boob booc boor boos bor- bori boro borr bors bosc bosi boso boss brcb bric brio bris brob broc broo bror bros brrr brrs brsb brsr bsci bscs bsic bsos bssc c-bo cbbc cbbs cbcc cbcr cbcs cbir cbsc cbsi ccbc cccb cccc ccci cccs ccic ccii ccir ccis ccob ccoc ccrc ccri ccrs ccsi ccss cibc cibi cibo cicc cici cico cicr cics ciii ciis ciob cior cios cirb circ ciri ciro cirr cirs cis- cisc cisr ciss cobb cobi cobo cobs coco coir cois coob coos cor- corb corc cori coro corr cors cosc cosi coso coss crbc crcc crcr crib cric cris crob croc croo cror crss cscb cscc csci csco cscr cscs csib csio csir csis csob csor csos csrc csrs cssr ibcs ibis ibos ibrc ibri ibro ibss icbc icbs iccb iccc icci icco iccr iccs icis icoc icor icos icrc icrr icrs icsb icsc icsi icsr icss iiii iiio iiis iioi iioo iios iirc iirs iisc iisi iisr iobi ioci ioii ioio iooi iooo ioos iori iors ioso ircc ircs iri- iric irio iris irob iroc irrc irri irrs iscc isci isco iscr iscs isic isis iso- isoc isor isos isri issc issi isso issr isss obbo obis oboi obor obos obri obro obsr obss ocbc occc occi ocis ocos ocro ocrr ocrs oici oiii oios oisc oobi oocr oooo ooos oosi orbb orbi orbo orbs orci orco orcs ori- oric orio oris oro- oror oros orri orro orrs orsi orso oscc osci osco osii osis osoi osoo osor osos osro ossb ossi osso rbbb rbbr rbbs rbis rbss rcbc rcbo rccb rccc rccs rcic rcis rcos rcsc rcsi rcss rib- ribo ribs ricc rico rics riis rios riri rirs risc risi riso riss rob- robb robi robo robs rocc roco rocs roio roir rois roob rooi roor roos rorc rori roro rosc rosi roso ross rrrr rsbi rscc rscs rsis rsos s-ib s-ic s-ii s-os sbbs sbcc sbcs sbic sbor sbsi scbi sccc sccs sci- scic scio scir scis scob scoo scor scr- scrc scri scrs scsc scsi scso scsr sibc sibi sibo sibs sicc sici sico sics sior sios sirc siri siro sirr sirs sisc sisi siss sobo sobr sobs soci soco socr socs soic soir sois soor soos sorb sori soro sorr sors sosi soso soss srbc srcc srib sris sros ssbr sscc ssci sscs ssis ssoc ssrc ssri ssrs sssb sssc sssi ssss