walis awlis wlais lwais alwis lawis wails awils wials iwals aiwls iawls wlias lwias wilas iwlas liwas ilwas aliws laiws ailws ialws liaws ilaws walsi awlsi wlasi lwasi alwsi lawsi wasli awsli wsali swali aswli sawli wlsai lwsai wslai swlai lswai slwai alswi laswi aslwi salwi lsawi slawi waisl awisl wiasl iwasl aiwsl iawsl wasil awsil wsail swail aswil sawil wisal iwsal wsial swial iswal siwal aiswl iaswl asiwl saiwl isawl siawl wlisa lwisa wilsa iwlsa liwsa ilwsa wlsia lwsia wslia swlia lswia slwia wisla iwsla wsila swila iswla siwla liswa ilswa lsiwa sliwa islwa silwa alisw laisw ailsw ialsw liasw ilasw alsiw lasiw asliw saliw lsaiw slaiw aislw iaslw asilw sailw isalw sialw lisaw ilsaw lsiaw sliaw islaw silaw
Note: these 'words' (valid or invalid) are all the permutations of the word walis. These words are obtained by scrambling the letters in walis.