sequ esqu sqeu qseu eqsu qesu seuq esuq sueq useq eusq uesq sque qsue suqe usqe quse uqse equs qeus euqs ueqs ques uqes
Note: these 'words' (valid or invalid) are all the permutations of the word sequ. These words are obtained by scrambling the letters in sequ.