tabby atbby tbaby btaby abtby batby tabby atbby tbaby btaby abtby batby tbbay btbay tbbay btbay bbtay bbtay abbty babty abbty babty bbaty bbaty tabyb atbyb tbayb btayb abtyb batyb taybb atybb tyabb ytabb aytbb yatbb tbyab btyab tybab ytbab bytab ybtab abytb baytb aybtb yabtb byatb ybatb tabyb atbyb tbayb btayb abtyb batyb taybb atybb tyabb ytabb aytbb yatbb tbyab btyab tybab ytbab bytab ybtab abytb baytb aybtb yabtb byatb ybatb tbbya btbya tbbya btbya bbtya bbtya tbyba btyba tybba ytbba bytba ybtba tbyba btyba tybba ytbba bytba ybtba bbyta bbyta bybta ybbta bybta ybbta abbyt babyt abbyt babyt bbayt bbayt abybt baybt aybbt yabbt byabt ybabt abybt baybt aybbt yabbt byabt ybabt bbyat bbyat bybat ybbat bybat ybbat
Note: these 'words' (valid or invalid) are all the permutations of the word tabby. These words are obtained by scrambling the letters in tabby.