tachs atchs tcahs ctahs acths caths tahcs athcs thacs htacs ahtcs hatcs tchas cthas thcas htcas chtas hctas achts cahts ahcts hacts chats hcats tacsh atcsh tcash ctash actsh catsh tasch atsch tsach stach astch satch tcsah ctsah tscah stcah cstah sctah acsth casth ascth sacth csath scath tahsc athsc thasc htasc ahtsc hatsc tashc atshc tsahc stahc asthc sathc thsac htsac tshac sthac hstac shtac ahstc hastc ashtc sahtc hsatc shatc tchsa cthsa thcsa htcsa chtsa hctsa tcsha ctsha tscha stcha cstha sctha thsca htsca tshca sthca hstca shtca chsta hcsta cshta schta hscta shcta achst cahst ahcst hacst chast hcast acsht casht ascht sacht csaht scaht ahsct hasct ashct sahct hsact shact chsat hcsat cshat schat hscat shcat
Note: these 'words' (valid or invalid) are all the permutations of the word tachs. These words are obtained by scrambling the letters in tachs.