bbbb bbeb bbfc bbpr bbrc bcbc bcbp bccc bcec bcer bcfc bcpp bebb bebe beeb beef beep beer befe beff berc bere berr bfpp bpcp bpfc bprc brcb brce breb brec bree bref brep brer brfc brrr cbbc cbcc cbce cbcp cbcr cbec cbee cbef cber cbfb cbfc cbpc cbpp cbre ccbc cccb cccc cccf cccp ccee ccfc ccff ccpe ccpp ccpr ccrc ccre ccrf ccrp cebp cec- cece cecp ceeb ceec cef- cefc cepc cepe cepp cepr cer- cerc cere cerf cerp cfbc cfbr cfcb cfcf cffb cffr cfpr cfrb cfre cfrp cpbc cpce cpeb cpep cper cpff cpre crbc crcc crce crcr cre- creb crec cree crep crfc crpc ebbc ebbr ebcc eber ebfc ecbc ecbe eccb eccc ecce ecef ecfc ecfr ecpp ecrc ecrf ecrr eeee eefe eerc efbr epcc epec epee eper epfc eppc eppp eprb eprp erbb erbe ercc erce ercp ereb erec erer erfc erpe errc erre fccf fccp fece feeb feer fefc fefe feff fepc ferb ferc fere ferr ffcc ffee ffff ffrr fp-c fpcc fprf frbc frcc frcp free frep frfc pbcc pbrf pcbc pccc pcce pcep pcer pcfc pcpb pcpp pcrc pcre pcrf pece pecr peec peep peer pefc peff pepe per- perc pere perf perp perr pfcb pfce pfff pffr ppcc pper pppp pprc pprf prbc prcc prcf prcp pre- preb prec pree pref prep prfc rbbb rbbr rcbc rccb rccc rcep rcfc rebb rebe recc rece recp recr reeb reef reep refe reff refr repe repp repr rere rfef rffc rpfc rrfc rrrr