sercc esrcc srecc rsecc erscc rescc secrc escrc scerc cserc ecsrc cesrc srcec rscec screc csrec rcsec crsec ercsc recsc ecrsc cersc rcesc cresc sercc esrcc srecc rsecc erscc rescc secrc escrc scerc cserc ecsrc cesrc srcec rscec screc csrec rcsec crsec ercsc recsc ecrsc cersc rcesc cresc seccr esccr scecr csecr ecscr cescr seccr esccr scecr csecr ecscr cescr sccer cscer sccer cscer ccser ccser eccsr cecsr eccsr cecsr ccesr ccesr srcce rscce scrce csrce rcsce crsce srcce rscce scrce csrce rcsce crsce sccre cscre sccre cscre ccsre ccsre rccse crcse rccse crcse ccrse ccrse erccs reccs ecrcs cercs rcecs crecs erccs reccs ecrcs cercs rcecs crecs eccrs cecrs eccrs cecrs ccers ccers rcces crces rcces crces ccres ccres
Note: these 'words' (valid or invalid) are all the permutations of the word sercc. These words are obtained by scrambling the letters in sercc.