shfcu hsfcu sfhcu fshcu hfscu fhscu shcfu hscfu schfu cshfu hcsfu chsfu sfchu fschu scfhu csfhu fcshu cfshu hfcsu fhcsu hcfsu chfsu fchsu cfhsu shfuc hsfuc sfhuc fshuc hfsuc fhsuc shufc hsufc suhfc ushfc husfc uhsfc sfuhc fsuhc sufhc usfhc fushc ufshc hfusc fhusc hufsc uhfsc fuhsc ufhsc shcuf hscuf schuf cshuf hcsuf chsuf shucf hsucf suhcf ushcf huscf uhscf scuhf csuhf suchf uschf cushf ucshf hcusf chusf hucsf uhcsf cuhsf uchsf sfcuh fscuh scfuh csfuh fcsuh cfsuh sfuch fsuch sufch usfch fusch ufsch scufh csufh sucfh uscfh cusfh ucsfh fcush cfush fucsh ufcsh cufsh ucfsh hfcus fhcus hcfus chfus fchus cfhus hfucs fhucs hufcs uhfcs fuhcs ufhcs hcufs chufs hucfs uhcfs cuhfs uchfs fcuhs cfuhs fuchs ufchs cufhs ucfhs
Note: these 'words' (valid or invalid) are all the permutations of the word shfcu. These words are obtained by scrambling the letters in shfcu.