carls acrls crals rcals arcls racls calrs aclrs clars lcars alcrs lacrs crlas rclas clras lcras rlcas lrcas arlcs ralcs alrcs larcs rlacs lracs carsl acrsl crasl rcasl arcsl racsl casrl acsrl csarl scarl ascrl sacrl crsal rcsal csral scral rscal srcal arscl rascl asrcl sarcl rsacl sracl calsr aclsr clasr lcasr alcsr lacsr caslr acslr csalr scalr asclr saclr clsar lcsar cslar sclar lscar slcar alscr lascr aslcr salcr lsacr slacr crlsa rclsa clrsa lcrsa rlcsa lrcsa crsla rcsla csrla scrla rscla srcla clsra lcsra cslra sclra lscra slcra rlsca lrsca rslca srlca lsrca slrca arlsc ralsc alrsc larsc rlasc lrasc arslc raslc asrlc sarlc rsalc sralc alsrc lasrc aslrc salrc lsarc slarc rlsac lrsac rslac srlac lsrac slrac
Note: these 'words' (valid or invalid) are all the permutations of the word carls. These words are obtained by scrambling the letters in carls.