yoffs oyffs yfofs fyofs ofyfs foyfs yoffs oyffs yfofs fyofs ofyfs foyfs yffos fyfos yffos fyfos ffyos ffyos offys fofys offys fofys ffoys ffoys yofsf oyfsf yfosf fyosf ofysf foysf yosff oysff ysoff syoff osyff soyff yfsof fysof ysfof syfof fsyof sfyof ofsyf fosyf osfyf sofyf fsoyf sfoyf yofsf oyfsf yfosf fyosf ofysf foysf yosff oysff ysoff syoff osyff soyff yfsof fysof ysfof syfof fsyof sfyof ofsyf fosyf osfyf sofyf fsoyf sfoyf yffso fyfso yffso fyfso ffyso ffyso yfsfo fysfo ysffo syffo fsyfo sfyfo yfsfo fysfo ysffo syffo fsyfo sfyfo ffsyo ffsyo fsfyo sffyo fsfyo sffyo offsy fofsy offsy fofsy ffosy ffosy ofsfy fosfy osffy soffy fsofy sfofy ofsfy fosfy osffy soffy fsofy sfofy ffsoy ffsoy fsfoy sffoy fsfoy sffoy
Note: these 'words' (valid or invalid) are all the permutations of the word yoffs. These words are obtained by scrambling the letters in yoffs.