yabby aybby ybaby byaby abyby bayby yabby aybby ybaby byaby abyby bayby ybbay bybay ybbay bybay bbyay bbyay abbyy babyy abbyy babyy bbayy bbayy yabyb aybyb ybayb byayb abyyb bayyb yaybb ayybb yyabb yyabb ayybb yaybb ybyab byyab yybab yybab byyab ybyab abyyb bayyb aybyb yabyb byayb ybayb yabyb aybyb ybayb byayb abyyb bayyb yaybb ayybb yyabb yyabb ayybb yaybb ybyab byyab yybab yybab byyab ybyab abyyb bayyb aybyb yabyb byayb ybayb ybbya bybya ybbya bybya bbyya bbyya ybyba byyba yybba yybba byyba ybyba ybyba byyba yybba yybba byyba ybyba bbyya bbyya bybya ybbya bybya ybbya abbyy babyy abbyy babyy bbayy bbayy abyby bayby aybby yabby byaby ybaby abyby bayby aybby yabby byaby ybaby bbyay bbyay bybay ybbay bybay ybbay
Note: these 'words' (valid or invalid) are all the permutations of the word yabby. These words are obtained by scrambling the letters in yabby.