wolds owlds wlods lwods olwds lowds wodls owdls wdols dwols odwls dowls wldos lwdos wdlos dwlos ldwos dlwos oldws lodws odlws dolws ldows dlows wolsd owlsd wlosd lwosd olwsd lowsd wosld owsld wsold swold oswld sowld wlsod lwsod wslod swlod lswod slwod olswd loswd oslwd solwd lsowd slowd wodsl owdsl wdosl dwosl odwsl dowsl wosdl owsdl wsodl swodl oswdl sowdl wdsol dwsol wsdol swdol dswol sdwol odswl doswl osdwl sodwl dsowl sdowl wldso lwdso wdlso dwlso ldwso dlwso wlsdo lwsdo wsldo swldo lswdo slwdo wdslo dwslo wsdlo swdlo dswlo sdwlo ldswo dlswo lsdwo sldwo dslwo sdlwo oldsw lodsw odlsw dolsw ldosw dlosw olsdw losdw osldw soldw lsodw slodw odslw doslw osdlw sodlw dsolw sdolw ldsow dlsow lsdow sldow dslow sdlow
Note: these 'words' (valid or invalid) are all the permutations of the word wolds. These words are obtained by scrambling the letters in wolds.