bbbb bbci bbpr bbrc bcbc bcbp bccc bcci bcit bcpp bcru bctc bcuc bcup bibb bibi bicc bici bipp bipu birb biri birr birt biru bitc bitt bitu bpcp bprc bpti brcb bric brit brrr brtc bruc brup brut btbp btcc btrc btrt bttb bubb bubi bubu bucc buci bucu buic buir buit buiu bupc bur- burb buri burp burr burt buru but- buti butt cbbc cbcc cbcp cbcr cbct cbcu cbir cbit cbpc cbpp cbrt cbtc ccbc cccb cccc ccci cccp cccu ccic ccii ccip ccir ccpp ccpr ccrc ccri ccrp ccrt cctb cctc cctt ccuc ccup ccut cibc cibi cicc cici cicr cict cicu ciii ciit cipp cirb circ ciri cirr cirt citb citi citp citt citu ciuc ciup cpbc cpcu cpic cpri cprt cptp cptr crbc crbu crcc crcr crib cric crip crit criu crpc crrt crtc crtp crub crup crut ctbi ctcp ctic ctpp ctrc ctrp cub- cubb cubi cucc cuci cui- cuir cuit cupp cupr curb curi curr curt cut- cutc cutt ibrc ibri ibtb ibtc icbc icbp iccb iccc icci iccp iccr icct iccu icpc icrc icrr icrt icru ictp icub icup iiii iiit iirc iitr iitt iiuc ipcc ipct ippc ippr ipri iptc ipur iput irbp ircc ircu iri- iric irip irpc irrc irri irti irtp itic itpc itri itup itur iucc iuiu iupp pbcc pcbc pccc pcip pcpb pcpp pcrc pibb pibi picc pici picr pict picu piip pipi pipp pirc piri pirr piru piti pitr pitt pitu ppcc ppci ppib ppic pppp pprc ppru pptt ppur prbc prcc prcp pri- prii prri prtc prti prtp prtr prut pruu ptcc pttc ptui pubu puir puit puiu pupi pupu pur- purb puri purp purr puru put- puti putt putu puuc rbbb rbbr rcbc rccb rccc rcic rcpi rcpt rctc rcti rib- ribu ricc rict ripi ripp ripr ript riri riti ritt ritu rpii rrrr rtcc rttp rubb rubi rubp rubu ruci ruct ruit rupp rupt rurc ruri rurp ruru ruti rutt rutu tbcb tbcc tbit tbrb tbtp tccc tccu tctc tibi tibu ticc tiit tiiu tip- tipc tipi tipp tipt tipu tirb tiri tirr tiru titc titi titp titt titu tpcp tpir tppp tppr tptp tptr tput trcc tri- trib tric trip trit trpc trpp trtc trtr trub truc trut truu ttbb ttcp tttt tubb tubr tubu tucc tuit tuiu tupi tupu turb turc turi turp turr turt turu tuti tutt tutu u-rp ubbi ubic ubii ubir ubit ubpc ucbc ucci uccp ucpb ucrc ucut uipi uirr upci upic uppc uppp uppu upri upup urbi urci urib uric uriu urri urup urur urut utri utti uttu uucp uuri uuuu