boxy obxy bxoy xboy oxby xoby boyx obyx byox ybox oybx yobx bxyo xbyo byxo ybxo xybo yxbo oxyb xoyb oyxb yoxb xyob yxob
Note: these 'words' (valid or invalid) are all the permutations of the word boxy. These words are obtained by scrambling the letters in boxy.