bbbb bbpr bbrc bcbc bcbp bccc bcpp bctc bpcp bprc brcb brrr brtc bry- btbp btcc btrc btrt btry bttb byrt cbbc cbcc cbcp cbcr cbct cbpc cbpp cbrt cbry cbtc cbyt ccbc cccb cccc cccp ccpp ccpr ccrc ccrp ccrt cctb cctc cctt cpbc cprt cptp cptr crbc crcc crcr crpc crrt crtc crtp cry- cryb ctcp ctpp ctrc ctrp cybb cybc cyc- cycb cycc cypc cyrt cyt- cytb cyy- cyyc pbcc pcbc pccc pcpb pcpp pcrc ppcc pppp pprc pptt prbc prcc prcp prtc prtp prtr ptcc pttc pypy pyr- pyry pytt rbbb rbbr rcbc rccb rccc rcpt rctc rcyc rpyc rrrr rtcc rttp rybp rytt ryyt tbcb tbcc tbrb tbtp tcby tccc tcpy tctc tpcp tppp tppr tptp tptr trcc trpc trpp trtc trtr try- tryb tryp ttbb ttcp tttt typ- typp typy tyr- tyrr tytt tyty ybry yccc yctc ypcc yyyy