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