niffy inffy nfify fnify ifnfy finfy niffy inffy nfify fnify ifnfy finfy nffiy fnfiy nffiy fnfiy ffniy ffniy iffny fifny iffny fifny ffiny ffiny nifyf infyf nfiyf fniyf ifnyf finyf niyff inyff nyiff yniff iynff yinff nfyif fnyif nyfif ynfif fynif yfnif ifynf fiynf iyfnf yifnf fyinf yfinf nifyf infyf nfiyf fniyf ifnyf finyf niyff inyff nyiff yniff iynff yinff nfyif fnyif nyfif ynfif fynif yfnif ifynf fiynf iyfnf yifnf fyinf yfinf nffyi fnfyi nffyi fnfyi ffnyi ffnyi nfyfi fnyfi nyffi ynffi fynfi yfnfi nfyfi fnyfi nyffi ynffi fynfi yfnfi ffyni ffyni fyfni yffni fyfni yffni iffyn fifyn iffyn fifyn ffiyn ffiyn ifyfn fiyfn iyffn yiffn fyifn yfifn ifyfn fiyfn iyffn yiffn fyifn yfifn ffyin ffyin fyfin yffin fyfin yffin
Note: these 'words' (valid or invalid) are all the permutations of the word niffy. These words are obtained by scrambling the letters in niffy.