wilts iwlts wlits lwits ilwts liwts witls iwtls wtils twils itwls tiwls wltis lwtis wtlis twlis ltwis tlwis iltws litws itlws tilws ltiws tliws wilst iwlst wlist lwist ilwst liwst wislt iwslt wsilt swilt iswlt siwlt wlsit lwsit wslit swlit lswit slwit ilswt liswt islwt silwt lsiwt sliwt witsl iwtsl wtisl twisl itwsl tiwsl wistl iwstl wsitl switl iswtl siwtl wtsil twsil wstil swtil tswil stwil itswl tiswl istwl sitwl tsiwl stiwl wltsi lwtsi wtlsi twlsi ltwsi tlwsi wlsti lwsti wslti swlti lswti slwti wtsli twsli wstli swtli tswli stwli ltswi tlswi lstwi sltwi tslwi stlwi iltsw litsw itlsw tilsw ltisw tlisw ilstw listw isltw siltw lsitw slitw itslw tislw istlw sitlw tsilw stilw ltsiw tlsiw lstiw sltiw tsliw stliw
Note: these 'words' (valid or invalid) are all the permutations of the word wilts. These words are obtained by scrambling the letters in wilts.