cccc cccp ccee ccpe ccpp ccpr ccrc ccre ccrp cec- cece cecp ceec cepc cepe cepp cepr cer- cerc cere cerp cery cpce cpep cper cpre crcc crce crcr cre- crec cree crep crpc cry- cyc- cycc cypc cyre cyy- cyyc eccc ecce ecpp ecrc ecrr eeee eerc eery epcc epec epee eper eppc eppp eppy eprp ercc erce ercp erec erer erpe errc erre eryc erye eyec eyer eyey eype eyre eyry eyyr pccc pcce pcep pcer pcpp pcrc pcre pece pecr pecy peec peep peer pepe per- perc pere perp perr pery peyr ppcc pper pppp pprc ppye prcc prcp pre- prec pree prep prey pyce pyep pype pypy pyr- pyre pyry rccc rcep rcyc recc rece recp recr recy reep repe repp repr repy rere rery reye rpyc rrrr rype yccc ycee yeep yeer yepe yepp yere yerr yery yeye yeyr ypcc yyyy