bufty ubfty bfuty fbuty ufbty fubty butfy ubtfy btufy tbufy utbfy tubfy bftuy fbtuy btfuy tbfuy ftbuy tfbuy uftby futby utfby tufby ftuby tfuby bufyt ubfyt bfuyt fbuyt ufbyt fubyt buyft ubyft byuft ybuft uybft yubft bfyut fbyut byfut ybfut fybut yfbut ufybt fuybt uyfbt yufbt fyubt yfubt butyf ubtyf btuyf tbuyf utbyf tubyf buytf ubytf byutf ybutf uybtf yubtf btyuf tbyuf bytuf ybtuf tybuf ytbuf utybf tuybf uytbf yutbf tyubf ytubf bftyu fbtyu btfyu tbfyu ftbyu tfbyu bfytu fbytu byftu ybftu fybtu yfbtu btyfu tbyfu bytfu ybtfu tybfu ytbfu ftybu tfybu fytbu yftbu tyfbu ytfbu uftyb futyb utfyb tufyb ftuyb tfuyb ufytb fuytb uyftb yuftb fyutb yfutb utyfb tuyfb uytfb yutfb tyufb ytufb ftyub tfyub fytub yftub tyfub ytfub
Note: these 'words' (valid or invalid) are all the permutations of the word bufty. These words are obtained by scrambling the letters in bufty.