eched cehed ehced heced cheed hceed ecehd ceehd eechd eechd ceehd ecehd ehecd heecd eehcd eehcd heecd ehecd cheed hceed cehed eched heced ehced echde cehde ehcde hecde chede hcede ecdhe cedhe edche deche cdehe dcehe ehdce hedce edhce dehce hdece dhece chdee hcdee cdhee dchee hdcee dhcee ecedh ceedh eecdh eecdh ceedh ecedh ecdeh cedeh edceh deceh cdeeh dceeh eedch eedch edech deech edech deech cedeh ecdeh cdeeh dceeh edceh deceh ehedc heedc eehdc eehdc heedc ehedc ehdec hedec edhec dehec hdeec dheec eedhc eedhc edehc deehc edehc deehc hedec ehdec hdeec dheec edhec dehec chede hcede cehde echde hecde ehcde chdee hcdee cdhee dchee hdcee dhcee cedhe ecdhe cdehe dcehe edche deche hedce ehdce hdece dhece edhce dehce
Note: these 'words' (valid or invalid) are all the permutations of the word eched. These words are obtained by scrambling the letters in eched.