fabby afbby fbaby bfaby abfby bafby fabby afbby fbaby bfaby abfby bafby fbbay bfbay fbbay bfbay bbfay bbfay abbfy babfy abbfy babfy bbafy bbafy fabyb afbyb fbayb bfayb abfyb bafyb faybb afybb fyabb yfabb ayfbb yafbb fbyab bfyab fybab yfbab byfab ybfab abyfb bayfb aybfb yabfb byafb ybafb fabyb afbyb fbayb bfayb abfyb bafyb faybb afybb fyabb yfabb ayfbb yafbb fbyab bfyab fybab yfbab byfab ybfab abyfb bayfb aybfb yabfb byafb ybafb fbbya bfbya fbbya bfbya bbfya bbfya fbyba bfyba fybba yfbba byfba ybfba fbyba bfyba fybba yfbba byfba ybfba bbyfa bbyfa bybfa ybbfa bybfa ybbfa abbyf babyf abbyf babyf bbayf bbayf abybf baybf aybbf yabbf byabf ybabf abybf baybf aybbf yabbf byabf ybabf bbyaf bbyaf bybaf ybbaf bybaf ybbaf
Note: these 'words' (valid or invalid) are all the permutations of the word fabby. These words are obtained by scrambling the letters in fabby.