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