salht aslht slaht lsaht alsht lasht sahlt ashlt shalt hsalt ahslt haslt slhat lshat shlat hslat lhsat hlsat alhst lahst ahlst halst lhast hlast salth aslth slath lsath alsth lasth satlh astlh stalh tsalh atslh taslh sltah lstah stlah tslah ltsah tlsah altsh latsh atlsh talsh ltash tlash sahtl ashtl shatl hsatl ahstl hastl sathl asthl stahl tsahl atshl tashl shtal hstal sthal tshal htsal thsal ahtsl hatsl athsl tahsl htasl thasl slhta lshta shlta hslta lhsta hlsta sltha lstha stlha tslha ltsha tlsha shtla hstla sthla tshla htsla thsla lhtsa hltsa lthsa tlhsa htlsa thlsa alhts lahts ahlts halts lhats hlats alths laths atlhs talhs ltahs tlahs ahtls hatls athls tahls htals thals lhtas hltas lthas tlhas htlas thlas
Note: these 'words' (valid or invalid) are all the permutations of the word salht. These words are obtained by scrambling the letters in salht.