edubc deubc eudbc uedbc duebc udebc edbuc debuc ebduc beduc dbeuc bdeuc eubdc uebdc ebudc beudc ubedc buedc dubec udbec dbuec bduec ubdec budec educb deucb eudcb uedcb duecb udecb edcub decub ecdub cedub dceub cdeub eucdb uecdb ecudb ceudb ucedb cuedb duceb udceb dcueb cdueb ucdeb cudeb edbcu debcu ebdcu bedcu dbecu bdecu edcbu decbu ecdbu cedbu dcebu cdebu ebcdu becdu ecbdu cebdu bcedu cbedu dbceu bdceu dcbeu cdbeu bcdeu cbdeu eubcd uebcd ebucd beucd ubecd buecd eucbd uecbd ecubd ceubd ucebd cuebd ebcud becud ecbud cebud bceud cbeud ubced buced ucbed cubed bcued cbued dubce udbce dbuce bduce ubdce budce ducbe udcbe dcube cdube ucdbe cudbe dbcue bdcue dcbue cdbue bcdue cbdue ubcde bucde ucbde cubde bcude cbude
Note: these 'words' (valid or invalid) are all the permutations of the word edubc. These words are obtained by scrambling the letters in edubc.