bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcrs bcru bcsc bcss bcuc bibb bibi bibs bicc bici bick bics biis biku birb biri birk birr birs biru bis- bisc bisk biss bisu brcb bric brik bris brkb brrr brrs brsb brsr bruc brus bsci bscs bsic bssc bubb bubi bubs bubu bucc buci buck bucs bucu buic buik buir buis buiu buki bukk buku bur- burb buri burk burr burs buru busc busi busk buss busu buus cbbc cbbs cbcc cbcr cbcs cbcu cbir cbkr 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 cikr cirb circ ciri cirk cirr cirs cis- cisc cisk cisr ciss ciuc cius ckbc ckbi ckck ckcs ckrc cksb crbc crbu crcc crcr crib cric crik cris criu crkc crss crub cruk crus cscb cscc csci cscr cscs csib csik csir csis csks csrc csrs cssr csur csus cub- cubb cubi cubs cucc cuci cuck cui- cuir cuis cuk- curb curi curr curs cusb cusk cuss cusu ibcs ibis ibrc ibri ibss ibus icbc icbs iccb iccc icci iccr iccs iccu icis icks icrc icrr icrs icru icsb icsc icsi icsr icss icub icus iiii iiis iirc iirs iisc iisi iisr iisu iiuc ikki ikri iksu ircc ircs ircu iri- iric iris irki irks irrc irri irrs irus iscc isci iscr iscs iscu isic isis isku isri issc issi issr isss issu isus iucc iuiu iuss k-ci kbbb kbbc kbbi kbbk kbbr kbbs kbbu kbcb kbci kbck kbcr kbcs kbcu kbib kbic kbik kbis kbiu kbkb kbkk kbkr kbrb kbrc kbri kbrk kbru kbsb kbsi kbsk kbsr kbss kbsu kbub kbuc kbuk kbur kbus kbuu kcbc kcbi kcbk kcbr kcbs kcbu kccb kccc kcci kcck kccr kccu kcic kcii kcir kcis kciu kckc kckk kckr kcrc kcri kcrr kcrs kcru kcsb kcsc kcsi kcsr kcss kcsu kcub kcui kcuk kibb kibc kibi kibr kibs kibu kicb kicc kick kicr kics kiic kiii kiik kiis kiiu kikc kiki kikk kikr kiku kirb kirc kiri kirk kirr kirs kiru kisc kisi kisk kisr kiss kisu kiur kiuu kkbb kkbi kkbr kkbs kkcb kkci kkck kkcr kkcs kkic kkik kkkk kkrb kkrc kkrk kkrr kkrs kksi kksr kkss kksu kkus kkuu krbb krbi krbk krbr krcb krcc krci krcs krcu krib krik kris krkc krki krkk krkr krks krku krrb krrc krri krrk krrr krrs krsc krsk krsr krss krsu kruc krui kruk krur ksbc ksbi ksbr ksbs kscb ksci ksck kscr kscs kscu ksib ksii ksik ksir ksis kskb kskk kskr ksks ksku ksrb ksrr ksrs kssi kssr ksss kssu ksub ksui ksuu kubb kubc kubr kubs kubu kucb kucc kuci kucr kuic kuik kuki kukk kuks kuku kurb kuri kurk kurr kurs kuru kusb kusc kusu kuub kuuk kuur kuuu rbbb rbbr rbbs rbis rbss rcbc rccb rccc rccs rcic rcis rcsc rcsi rcss rib- ribs ribu ricc rick rics riis riki rikk riku riri rirs risc risi risk riss risu rius rkss rrrr rsbi rscc rscs rsis rubb rubi rubs rubu ruci ruck ruis ruki rukk ruku rurc ruri rurs ruru rusi rusk russ rusu s-ib s-ic s-ii sbbs sbcc sbcs sbic sbrk sbsi sbus scbi sccc sccs sci- scic scir scis sck- scr- scrc scri scrs scsc scsi scsr scsu scub scur sibc sibi sibs sibu sicc sici sick sics sicu siik siki sikr siks siku sirc siri sirk sirr sirs siru sisc sisi sisk siss sisu siui sius skic skik skir skis skiu skss skui skur srbc srcc srib sris srub ssbr sscc ssci sscs ssis ssrc ssri ssrs sssb sssc sssi ssss sub- subb subi subs suc- succ suci suck sucr sucs suir suis suki suks suku sur- surc suri surr surs suru sus- susi susk suss susu suus ubbi ubic ubii ubik ubir ubis ucbc ucci ucrc ucsb ucsc ucsu uirr ukcc ukrc uksc ukur urbi urbs urci urib uric urik uris uriu urri ursi urss ursu uruk urur urus us-k usbc usbr usbs uscc uscs usis ussb ussc ussr usss ussu usui usus uuri uusi uuuu