letch eltch ltech tlech etlch telch lecth elcth lceth cleth eclth celth ltceh tlceh lcteh clteh tcleh ctleh etclh teclh ectlh cetlh tcelh ctelh lethc elthc ltehc tlehc etlhc telhc lehtc elhtc lhetc hletc ehltc heltc lthec tlhec lhtec hltec thlec htlec ethlc tehlc ehtlc hetlc thelc htelc lecht elcht lceht cleht eclht celht lehct elhct lhect hlect ehlct helct lchet clhet lhcet hlcet chlet hclet echlt cehlt ehclt heclt chelt hcelt ltche tlche lcthe clthe tclhe ctlhe lthce tlhce lhtce hltce thlce htlce lchte clhte lhcte hlcte chlte hclte tchle cthle thcle htcle chtle hctle etchl techl ecthl cethl tcehl ctehl ethcl tehcl ehtcl hetcl thecl htecl echtl cehtl ehctl hectl chetl hcetl tchel cthel thcel htcel chtel hctel
Note: these 'words' (valid or invalid) are all the permutations of the word letch. These words are obtained by scrambling the letters in letch.