shists hsists sihsts ishsts hissts ihssts shsits hssits sshits sshits hssits shsits sishts isshts ssihts ssihts isshts sishts hissts ihssts hsists shists ishsts sihsts shitss hsitss sihtss ishtss histss ihstss shtiss hstiss sthiss tshiss htsiss thsiss sithss isthss stihss tsihss itshss tishss hitsss ihtsss htisss thisss ithsss tihsss shstis hsstis sshtis sshtis hsstis shstis shtsis hstsis sthsis tshsis htssis thssis ssthis ssthis stshis tsshis stshis tsshis hstsis shtsis htssis thssis sthsis tshsis sisths issths ssiths ssiths issths sisths sitshs istshs stishs tsishs itsshs tisshs sstihs sstihs stsihs tssihs stsihs tssihs istshs sitshs itsshs tisshs stishs tsishs histss ihstss hsitss shitss ishtss sihtss hitsss ihtsss htisss thisss ithsss tihsss hstiss shtiss htsiss thsiss sthiss tshiss isthss sithss itshss tishss stihss tsihss shisst hsisst sihsst ishsst hissst ihssst shsist hssist sshist sshist hssist shsist sishst isshst ssihst ssihst isshst sishst hissst ihssst hsisst shisst ishsst sihsst shisst hsisst sihsst ishsst hissst ihssst shsist hssist sshist sshist hssist shsist sishst isshst ssihst ssihst isshst sishst hissst ihssst hsisst shisst ishsst sihsst shssit hsssit sshsit sshsit hsssit shssit shssit hsssit sshsit sshsit hsssit shssit ssshit ssshit ssshit ssshit ssshit ssshit hsssit shssit hsssit shssit sshsit sshsit sissht isssht ssisht ssisht isssht sissht sissht isssht ssisht ssisht isssht sissht sssiht sssiht sssiht sssiht sssiht sssiht isssht sissht isssht sissht ssisht ssisht hissst ihssst hsisst shisst ishsst sihsst hissst ihssst hsisst shisst ishsst sihsst hssist shsist hssist shsist sshist sshist isshst sishst isshst sishst ssihst ssihst shitss hsitss sihtss ishtss histss ihstss shtiss hstiss sthiss tshiss htsiss thsiss sithss isthss stihss tsihss itshss tishss hitsss ihtsss htisss thisss ithsss tihsss shists hsists sihsts ishsts hissts ihssts shsits hssits sshits sshits hssits shsits sishts isshts ssihts ssihts isshts sishts hissts ihssts hsists shists ishsts sihsts shtsis hstsis sthsis tshsis htssis thssis shstis hsstis sshtis sshtis hsstis shstis stshis tsshis ssthis ssthis tsshis stshis htssis thssis hstsis shtsis tshsis sthsis sitshs istshs stishs tsishs itsshs tisshs sisths issths ssiths ssiths issths sisths stsihs tssihs sstihs sstihs tssihs stsihs itsshs tisshs istshs sitshs tsishs stishs hitsss ihtsss htisss thisss ithsss tihsss histss ihstss hsitss shitss ishtss sihtss htsiss thsiss hstiss shtiss tshiss sthiss itshss tishss isthss sithss tsihss stihss shstsi hsstsi sshtsi sshtsi hsstsi shstsi shtssi hstssi sthssi tshssi htsssi thsssi ssthsi ssthsi stshsi tsshsi stshsi tsshsi hstssi shtssi htsssi thsssi sthssi tshssi shssti hsssti sshsti sshsti hsssti shssti shssti hsssti sshsti sshsti hsssti shssti ssshti ssshti ssshti ssshti ssshti ssshti hsssti shssti hsssti shssti sshsti sshsti shtssi hstssi sthssi tshssi htsssi thsssi shstsi hsstsi sshtsi sshtsi hsstsi shstsi stshsi tsshsi ssthsi ssthsi tsshsi stshsi htsssi thsssi hstssi shtssi tshssi sthssi sstshi sstshi stsshi tssshi stsshi tssshi sssthi sssthi sssthi sssthi sssthi sssthi stsshi tssshi sstshi sstshi tssshi stsshi stsshi tssshi sstshi sstshi tssshi stsshi hstssi shtssi htsssi thsssi sthssi tshssi hsstsi shstsi hsstsi shstsi sshtsi sshtsi htsssi thsssi hstssi shtssi tshssi sthssi stshsi tsshsi ssthsi ssthsi tsshsi stshsi sistsh isstsh ssitsh ssitsh isstsh sistsh sitssh istssh stissh tsissh itsssh tisssh sstish sstish stsish tssish stsish tssish istssh sitssh itsssh tisssh stissh tsissh sissth isssth ssisth ssisth isssth sissth sissth isssth ssisth ssisth isssth sissth sssith sssith sssith sssith sssith sssith isssth sissth isssth sissth ssisth ssisth sitssh istssh stissh tsissh itsssh tisssh sistsh isstsh ssitsh ssitsh isstsh sistsh stsish tssish sstish sstish tssish stsish itsssh tisssh istssh sitssh tsissh stissh sstsih sstsih stssih tsssih stssih tsssih ssstih ssstih ssstih ssstih ssstih ssstih stssih tsssih sstsih sstsih tsssih stssih stssih tsssih sstsih sstsih tsssih stssih istssh sitssh itsssh tisssh stissh tsissh isstsh sistsh isstsh sistsh ssitsh ssitsh itsssh tisssh istssh sitssh tsissh stissh stsish tssish sstish sstish tssish stsish histss ihstss hsitss shitss ishtss sihtss hitsss ihtsss htisss thisss ithsss tihsss hstiss shtiss htsiss thsiss sthiss tshiss isthss sithss itshss tishss stihss tsihss hissts ihssts hsists shists ishsts sihsts hissts ihssts hsists shists ishsts sihsts hssits shsits hssits shsits sshits sshits isshts sishts isshts sishts ssihts ssihts hitsss ihtsss htisss thisss ithsss tihsss histss ihstss hsitss shitss ishtss sihtss htsiss thsiss hstiss shtiss tshiss sthiss itshss tishss isthss sithss tsihss stihss hstsis shtsis htssis thssis sthsis tshsis hsstis shstis hsstis shstis sshtis sshtis htssis thssis hstsis shtsis tshsis sthsis stshis tsshis ssthis ssthis tsshis stshis istshs sitshs itsshs tisshs stishs tsishs issths sisths issths sisths ssiths ssiths itsshs tisshs istshs sitshs tsishs stishs stsihs tssihs sstihs sstihs tssihs stsihs
Note: these 'words' (valid or invalid) are all the permutations of the word shists. These words are obtained by scrambling the letters in shists.