redws erdws rdews drews edrws derws rewds erwds rweds wreds ewrds werds rdwes drwes rwdes wrdes dwres wdres edwrs dewrs ewdrs wedrs dwers wders redsw erdsw rdesw dresw edrsw dersw resdw ersdw rsedw sredw esrdw serdw rdsew drsew rsdew srdew dsrew sdrew edsrw desrw esdrw sedrw dserw sderw rewsd erwsd rwesd wresd ewrsd wersd reswd erswd rsewd srewd esrwd serwd rwsed wrsed rswed srwed wsred swred ewsrd wesrd eswrd sewrd wserd swerd rdwse drwse rwdse wrdse dwrse wdrse rdswe drswe rsdwe srdwe dsrwe sdrwe rwsde wrsde rswde srwde wsrde swrde dwsre wdsre dswre sdwre wsdre swdre edwsr dewsr ewdsr wedsr dwesr wdesr edswr deswr esdwr sedwr dsewr sdewr ewsdr wesdr eswdr sewdr wsedr swedr dwser wdser dswer sdwer wsder swder
Note: these 'words' (valid or invalid) are all the permutations of the word redws. These words are obtained by scrambling the letters in redws.