dummy udmmy dmumy mdumy umdmy mudmy dummy udmmy dmumy mdumy umdmy mudmy dmmuy mdmuy dmmuy mdmuy mmduy mmduy ummdy mumdy ummdy mumdy mmudy mmudy dumym udmym dmuym mduym umdym mudym duymm udymm dyumm ydumm uydmm yudmm dmyum mdyum dymum ydmum mydum ymdum umydm muydm uymdm yumdm myudm ymudm dumym udmym dmuym mduym umdym mudym duymm udymm dyumm ydumm uydmm yudmm dmyum mdyum dymum ydmum mydum ymdum umydm muydm uymdm yumdm myudm ymudm dmmyu mdmyu dmmyu mdmyu mmdyu mmdyu dmymu mdymu dymmu ydmmu mydmu ymdmu dmymu mdymu dymmu ydmmu mydmu ymdmu mmydu mmydu mymdu ymmdu mymdu ymmdu ummyd mumyd ummyd mumyd mmuyd mmuyd umymd muymd uymmd yummd myumd ymumd umymd muymd uymmd yummd myumd ymumd mmyud mmyud mymud ymmud mymud ymmud
Note: these 'words' (valid or invalid) are all the permutations of the word dummy. These words are obtained by scrambling the letters in dummy.