cccc cccm ccee ccmc ccmm ccrc ccre cec- cece cecm ceec ceem ceme cemm cemr cer- cerc cere cexe cmcc cmec cmmc cmrr crcc crce crcr cre- crec cree crem crex cxxx eccc ecce eccm ecem ecrc ecrm ecrr eeee eerc emcc emer emex emme emre er-x ercc erce erec erem erer ermc erme errc erre exec exer exmr exrx mccc mccx mcmc mcmx mcrc mcxc mec- mecc mece mecr meem meer memc meme memr memx mer- merc mere merm mexx mmcc mmcm mmcx mmmc mmmm mmrc mmxx mr-c mrcc mrce mree mrmc mrrc rccc recc rece recm recr reem reme rere rexx rrmc rrrr xeer xeme xer- xexe xxxx