freco rfeco ferco efrco refco erfco frceo rfceo fcreo cfreo rcfeo crfeo fecro efcro fcero cfero ecfro cefro recfo ercfo rcefo crefo ecrfo cerfo freoc rfeoc feroc efroc refoc erfoc froec rfoec forec ofrec rofec orfec feorc eforc foerc oferc eofrc oefrc reofc erofc roefc orefc eorfc oerfc frcoe rfcoe fcroe cfroe rcfoe crfoe froce rfoce force ofrce rofce orfce fcore cfore focre ofcre cofre ocfre rcofe crofe rocfe orcfe corfe ocrfe fecor efcor fceor cfeor ecfor cefor feocr efocr foecr ofecr eofcr oefcr fcoer cfoer focer ofcer cofer ocfer ecofr ceofr eocfr oecfr coefr ocefr recof ercof rceof creof ecrof cerof reocf erocf roecf orecf eorcf oercf rcoef croef rocef orcef coref ocref ecorf ceorf eocrf oecrf coerf ocerf
Note: these 'words' (valid or invalid) are all the permutations of the word freco. These words are obtained by scrambling the letters in freco.