bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcrs bcru bcsc bcss bcuc bibb bibi bibs bicc bici bics biis birb biri birr birs biru bis- bisc biss bisu brcb bric bris brrr brrs brsb brsr bruc brus bsci bscs bsic bssc bubb bubi bubs bubu bucc buci bucs bucu buic buir buis buiu bur- burb buri burr burs buru busc busi buss busu buus cbbc cbbs cbcc cbcr cbcs cbcu cbir cbsc cbsi cbus ccbc cccb cccc ccci cccs cccu ccic ccii ccir ccis ccrc ccri ccrs ccsi ccss ccuc ccus cibc cibi cicc cici cicr cics cicu ciii ciis cirb circ ciri cirr cirs cis- cisc cisr ciss ciuc cius crbc crbu crcc crcr crib cric cris criu crss crub crus cscb cscc csci cscr cscs csib csir csis csrc csrs cssr csur csus cub- cubb cubi cubs cucc cuci cui- cuir cuis curb curi curr curs cusb cuss cusu ibcs ibis ibrc ibri ibss ibus icbc icbs iccb iccc icci iccr iccs iccu icis icrc icrr icrs icru icsb icsc icsi icsr icss icub icus iiii iiis iirc iirs iisc iisi iisr iisu iiuc ircc ircs ircu iri- iric iris irrc irri irrs irus iscc isci iscr iscs iscu isic isis isri issc issi issr isss issu isus iucc iuiu iuss rbbb rbbr rbbs rbis rbss rcbc rccb rccc rccs rcic rcis rcsc rcsi rcss rib- ribs ribu ricc rics riis riri rirs risc risi riss risu rius rrrr rsbi rscc rscs rsis rubb rubi rubs rubu ruci ruis rurc ruri rurs ruru rusi russ rusu s-ib s-ic s-ii sbbs sbcc sbcs sbic sbsi sbus scbi sccc sccs sci- scic scir scis scr- scrc scri scrs scsc scsi scsr scsu scub scur sibc sibi sibs sibu sicc sici sics sicu sirc siri sirr sirs siru sisc sisi siss sisu siui sius srbc srcc srib sris srub ssbr sscc ssci sscs ssis ssrc ssri ssrs sssb sssc sssi ssss sub- subb subi subs suc- succ suci sucr sucs suir suis sur- surc suri surr surs suru sus- susi suss susu suus ubbi ubic ubii ubir ubis ucbc ucci ucrc ucsb ucsc ucsu uirr urbi urbs urci urib uric uris uriu urri ursi urss ursu urur urus usbc usbr usbs uscc uscs usis ussb ussc ussr usss ussu usui usus uuri uusi uuuu