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