ctels tcels cetls ectls tecls etcls ctles tcles cltes lctes tlces ltces celts eclts clets lcets elcts lects telcs etlcs tlecs ltecs eltcs letcs ctesl tcesl cetsl ectsl tecsl etcsl ctsel tcsel cstel sctel tscel stcel cestl ecstl csetl scetl esctl sectl tescl etscl tsecl stecl estcl setcl ctlse tclse cltse lctse tlcse ltcse ctsle tcsle cstle sctle tscle stcle clste lcste cslte sclte lscte slcte tlsce ltsce tslce stlce lstce sltce celst eclst clest lcest elcst lecst ceslt ecslt cselt scelt esclt seclt clset lcset cslet sclet lscet slcet elsct lesct eslct selct lsect slect telsc etlsc tlesc ltesc eltsc letsc teslc etslc tselc stelc estlc setlc tlsec ltsec tslec stlec lstec sltec elstc lestc esltc seltc lsetc sletc
Note: these 'words' (valid or invalid) are all the permutations of the word ctels. These words are obtained by scrambling the letters in ctels.