wswd swwd wwsd wwsd swwd wswd wsdw swdw wdsw dwsw sdww dsww wwds wwds wdws dwws wdws dwws swdw wsdw sdww dsww wdsw dwsw
Note: these 'words' (valid or invalid) are all the permutations of the word wswd. These words are obtained by scrambling the letters in wswd.