walls awlls wlals lwals alwls lawls walls awlls wlals lwals alwls lawls wllas lwlas wllas lwlas llwas llwas allws lalws allws lalws llaws llaws walsl awlsl wlasl lwasl alwsl lawsl wasll awsll wsall swall aswll sawll wlsal lwsal wslal swlal lswal slwal alswl laswl aslwl salwl lsawl slawl walsl awlsl wlasl lwasl alwsl lawsl wasll awsll wsall swall aswll sawll wlsal lwsal wslal swlal lswal slwal alswl laswl aslwl salwl lsawl slawl wllsa lwlsa wllsa lwlsa llwsa llwsa wlsla lwsla wslla swlla lswla slwla wlsla lwsla wslla swlla lswla slwla llswa llswa lslwa sllwa lslwa sllwa allsw lalsw allsw lalsw llasw llasw alslw laslw asllw sallw lsalw slalw alslw laslw asllw sallw lsalw slalw llsaw llsaw lslaw sllaw lslaw sllaw
Note: these 'words' (valid or invalid) are all the permutations of the word walls. These words are obtained by scrambling the letters in walls.