bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcit bcrs bcru bcsc bcss bctc bcts bcuc bibb bibi bibs bicc bici bics biis birb biri birr birs birt biru birx bis- bisc biss bist bisu bitc bits bitt bitu bitx bixi brcb bric bris brit brix brrr brrs brsb brsr brst brtc bruc brus brut brux bsci bscs bsic bsix bssc bsts btcc btcs btcx btrc btrt btss bttb btus bubb bubi bubs bubu bucc buci bucs bucu buic buir buis buit buiu buix bur- burb buri burr burs burt buru busc busi buss bust busu busx but- buti buts butt buus cbbc cbbs cbcc cbcr cbcs cbct cbcu cbir cbit cbrt cbsc cbsi cbtc cbus cbux ccbc cccb cccc ccci cccs cccu ccic ccii ccir ccis ccix ccrc ccri ccrs ccrt ccsi ccss ccst cctb cctc cctt ccuc ccus ccut ccxi cibc cibi cicc cici cicr cics cict cicu ciii ciis ciit cirb circ ciri cirr cirs cirt cis- cisc cisr ciss cist citb citi cits citt citu ciuc cius cixi crbc crbu crcc crcr crib cric cris crit criu crrt crss crst crtc crts crub crus crut crux cscb cscc csci cscr cscs csib csir csis csit csix csrc csrs cssr cstc cstr csts cstx csur csus csxt ctbi ctbs ctic ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubi cubs cucc cuci cui- cuir cuis cuit curb curi curr curs curt cusb cuss cust cusu cut- cutc cuts cutt cxii cxix cxxi cxxx ibcs ibis ibrc ibri ibss ibtb ibtc ibts ibus icbc icbs iccb iccc icci iccr iccs icct iccu icis icrc icrr icrs icrt icru icsb icsc icsi icsr icss icst icts icub icus iiii iiis iiit iirc iirs iisc iisi iisr iist iisu iitr iitt iiuc ircc ircs ircu ircx iri- iric iris irix irrc irri irrs irti irts irus isbt isbx iscc isci iscr iscs isct iscu isic isis isit isri issc issi issr isss issu istc isti istr ists isus itbs itcs itic itis itri itrs itsi itsu itur iucc iuiu iuss iust ixxi rbbb rbbr rbbs rbis rbss rbst rcbc rccb rccc rccs rcic rcis rcsc rcsi rcss rctc rcti rcts rib- ribs ribu ricc rics rict riis riri rirs risc risi riss rist risu riti rits ritt ritu rius rixc rrrr rsbi rscc rscs rsis rsts rstu rtcc rtss rtts rubb rubi rubs rubu ruci ruct ruis ruit rurc ruri rurs ruru rusi russ rust rusu ruti ruts rutt rutu s-ib s-ic s-ii sbbs sbcc sbcs sbct sbic sbsi sbst sbtc sbus scbi sccc sccs scct sci- scic scir scis scit scr- scrc scri scrs scsc scsi scsr scst scsu sctc sctr scts scub scur scut sibc sibi sibs sibu sicc sici sics sicu siit sirc siri sirr sirs sirt siru sisc sisi siss sist sisu sit- sitc siti sits sitt situ siui sius siut sixt sixx srbc srcc srct srib sris srtr srub ssbr sscc ssci sscs ssis ssit ssrc ssri ssrs sssb sssc sssi ssss sstb sstc ssts stbc stbs stcc stcs stcu stib stic stir stis stit stix strc stri strs stru stsi stss sttc sttr stub stuc stur stus stut stux sub- subb subi subs suc- succ suci sucr sucs suir suis suit sur- surc suri surr surs surt suru sus- susi suss sust susu suti sutu suus sux- suxt tbbs tbcb tbcc tbit tbrb tbst tcbs tccc tccu tctc tcts tibi tibs tibu ticc tics tiit tiiu tirb tiri tirr tirs tiru tisb tisi tiss tist titc titi tits titt titu tixt trcc tri- trib tric tris trit trix trsi trst trtc trtr trub truc trus trut truu trux tsbc tscc tsis tsix tssi tssr tsst tstc tsts tsui ttbb ttss tttt tubb tubr tubs tubu tucc tuis tuit tuiu tuix turb turc turi turr turs turt turu tusc tusi tuss tust tuti tuts tutt tutu tuxs txii txtr ubbi ubic ubii ubir ubis ubit ucbc ucci ucrc ucsb ucsc ucst ucsu ucut uirr uist uits urbi urbs urci urib uric uris uriu urix urri ursi urss ursu urts urur urus urut usbc usbr usbs uscc uscs usis usix ussb ussc ussr usss usst ussu ustb ustc usti usts usui usus utis utri utsc utti uttu uuri uusi uuuu uxus xcii xcis xcri xibu xics xiii xisi xist xixi xtbs xtsr xuri xurs xuxu xxii xxix xxxi xxxx