cstos sctos ctsos tcsos stcos tscos csots scots costs ocsts socts oscts ctoss tcoss cotss octss tocss otcss stocs tsocs sotcs ostcs toscs otscs cstso sctso ctsso tcsso stcso tscso cssto scsto cssto scsto sscto sscto ctsso tcsso cstso sctso tscso stcso stsco tssco sstco sstco tssco stsco csost scost cosst ocsst socst oscst cssot scsot cssot scsot sscot sscot cosst ocsst csost scost oscst socst sosct ossct ssoct ssoct ossct sosct ctoss tcoss cotss octss tocss otcss ctsos tcsos cstos sctos tscos stcos costs ocsts csots scots oscts socts toscs otscs tsocs stocs ostcs sotcs stosc tsosc sotsc ostsc tossc otssc stsoc tssoc sstoc sstoc tssoc stsoc sostc osstc ssotc ssotc osstc sostc tossc otssc tsosc stosc ostsc sotsc
Note: these 'words' (valid or invalid) are all the permutations of the word cstos. These words are obtained by scrambling the letters in cstos.