clsas lcsas cslas sclas lscas slcas class lcass calss aclss lacss alcss csals scals casls acsls sacls ascls lsacs slacs lascs alscs salcs aslcs clssa lcssa cslsa sclsa lscsa slcsa clssa lcssa cslsa sclsa lscsa slcsa cssla scsla cssla scsla sscla sscla lssca slsca lssca slsca sslca sslca class lcass calss aclss lacss alcss clsas lcsas cslas sclas lscas slcas casls acsls csals scals ascls sacls lascs alscs lsacs slacs aslcs salcs csasl scasl cassl acssl sacsl ascsl cssal scsal cssal scsal sscal sscal cassl acssl csasl scasl ascsl sacsl sascl asscl ssacl ssacl asscl sascl lsasc slasc lassc alssc salsc aslsc lssac slsac lssac slsac sslac sslac lassc alssc lsasc slasc aslsc salsc saslc asslc ssalc ssalc asslc saslc
Note: these 'words' (valid or invalid) are all the permutations of the word clsas. These words are obtained by scrambling the letters in clsas.