lests elsts lsets slets eslts selts letss eltss ltess tless etlss telss lstes sltes ltses tlses stles tsles estls setls etsls tesls stels tsels lesst elsst lsest slest eslst selst lesst elsst lsest slest eslst selst lsset slset lsset slset sslet sslet esslt seslt esslt seslt sselt sselt letss eltss ltess tless etlss telss lests elsts lsets slets eslts selts ltses tlses lstes sltes tsles stles etsls tesls estls setls tsels stels lstse sltse ltsse tlsse stlse tslse lsste slste lsste slste sslte sslte ltsse tlsse lstse sltse tslse stlse stsle tssle sstle sstle tssle stsle estsl setsl etssl tessl stesl tsesl esstl sestl esstl sestl ssetl ssetl etssl tessl estsl setsl tsesl stesl stsel tssel sstel sstel tssel stsel
Note: these 'words' (valid or invalid) are all the permutations of the word lests. These words are obtained by scrambling the letters in lests.