shafts hsafts sahfts ashfts hasfts ahsfts shfats hsfats sfhats fshats hfsats fhsats safhts asfhts sfahts fsahts afshts fashts hafsts ahfsts hfasts fhasts afhsts fahsts shatfs hsatfs sahtfs ashtfs hastfs ahstfs shtafs hstafs sthafs tshafs htsafs thsafs sathfs asthfs stahfs tsahfs atshfs tashfs hatsfs ahtsfs htasfs thasfs athsfs tahsfs shftas hsftas sfhtas fshtas hfstas fhstas shtfas hstfas sthfas tshfas htsfas thsfas sfthas fsthas stfhas tsfhas ftshas tfshas hftsas fhtsas htfsas thfsas fthsas tfhsas safths asfths sfaths fsaths afsths fasths satfhs astfhs stafhs tsafhs atsfhs tasfhs sftahs fstahs stfahs tsfahs ftsahs tfsahs aftshs fatshs atfshs tafshs ftashs tfashs haftss ahftss hfatss fhatss afhtss fahtss hatfss ahtfss htafss thafss athfss tahfss hftass fhtass htfass thfass fthass tfhass afthss fathss atfhss tafhss ftahss tfahss shafst hsafst sahfst ashfst hasfst ahsfst shfast hsfast sfhast fshast hfsast fhsast safhst asfhst sfahst fsahst afshst fashst hafsst ahfsst hfasst fhasst afhsst fahsst shasft hsasft sahsft ashsft hassft ahssft shsaft hssaft sshaft sshaft hssaft shsaft sashft asshft ssahft ssahft asshft sashft hassft ahssft hsasft shasft ashsft sahsft shfsat hsfsat sfhsat fshsat hfssat fhssat shsfat hssfat sshfat sshfat hssfat shsfat sfshat fsshat ssfhat ssfhat fsshat sfshat hfssat fhssat hsfsat shfsat fshsat sfhsat safsht asfsht sfasht fsasht afssht fassht sasfht assfht ssafht ssafht assfht sasfht sfsaht fssaht ssfaht ssfaht fssaht sfsaht afssht fassht asfsht safsht fsasht sfasht hafsst ahfsst hfasst fhasst afhsst fahsst hasfst ahsfst hsafst shafst ashfst sahfst hfsast fhsast hsfast shfast fshast sfhast afshst fashst asfhst safhst fsahst sfahst shatsf hsatsf sahtsf ashtsf hastsf ahstsf shtasf hstasf sthasf tshasf htsasf thsasf sathsf asthsf stahsf tsahsf atshsf tashsf hatssf ahtssf htassf thassf athssf tahssf shastf hsastf sahstf ashstf hasstf ahsstf shsatf hssatf sshatf sshatf hssatf shsatf sashtf asshtf ssahtf ssahtf asshtf sashtf hasstf ahsstf hsastf shastf ashstf sahstf shtsaf hstsaf sthsaf tshsaf htssaf thssaf shstaf hsstaf sshtaf sshtaf hsstaf shstaf stshaf tsshaf ssthaf ssthaf tsshaf stshaf htssaf thssaf hstsaf shtsaf tshsaf sthsaf satshf astshf stashf tsashf atsshf tasshf sasthf assthf ssathf ssathf assthf sasthf stsahf tssahf sstahf sstahf tssahf stsahf atsshf tasshf astshf satshf tsashf stashf hatssf ahtssf htassf thassf athssf tahssf hastsf ahstsf hsatsf shatsf ashtsf sahtsf htsasf thsasf hstasf shtasf tshasf sthasf atshsf tashsf asthsf sathsf tsahsf stahsf shftsa hsftsa sfhtsa fshtsa hfstsa fhstsa shtfsa hstfsa sthfsa tshfsa htsfsa thsfsa sfthsa fsthsa stfhsa tsfhsa ftshsa tfshsa hftssa fhtssa htfssa thfssa fthssa tfhssa shfsta hsfsta sfhsta fshsta hfssta fhssta shsfta hssfta sshfta sshfta hssfta shsfta sfshta fsshta ssfhta ssfhta fsshta sfshta hfssta fhssta hsfsta shfsta fshsta sfhsta shtsfa hstsfa sthsfa tshsfa htssfa thssfa shstfa hsstfa sshtfa sshtfa hsstfa shstfa stshfa tsshfa ssthfa ssthfa tsshfa stshfa htssfa thssfa hstsfa shtsfa tshsfa sthsfa sftsha fstsha stfsha tsfsha ftssha tfssha sfstha fsstha ssftha ssftha fsstha sfstha stsfha tssfha sstfha sstfha tssfha stsfha ftssha tfssha fstsha sftsha tsfsha stfsha hftssa fhtssa htfssa thfssa fthssa tfhssa hfstsa fhstsa hsftsa shftsa fshtsa sfhtsa htsfsa thsfsa hstfsa shtfsa tshfsa sthfsa ftshsa tfshsa fsthsa sfthsa tsfhsa stfhsa saftsh asftsh sfatsh fsatsh afstsh fastsh satfsh astfsh stafsh tsafsh atsfsh tasfsh sftash fstash stfash tsfash ftsash tfsash aftssh fatssh atfssh tafssh ftassh tfassh safsth asfsth sfasth fsasth afssth fassth sasfth assfth ssafth ssafth assfth sasfth sfsath fssath ssfath ssfath fssath sfsath afssth fassth asfsth safsth fsasth sfasth satsfh astsfh stasfh tsasfh atssfh tassfh sastfh asstfh ssatfh ssatfh asstfh sastfh stsafh tssafh sstafh sstafh tssafh stsafh atssfh tassfh astsfh satsfh tsasfh stasfh sftsah fstsah stfsah tsfsah ftssah tfssah sfstah fsstah ssftah ssftah fsstah sfstah stsfah tssfah sstfah sstfah tssfah stsfah ftssah tfssah fstsah sftsah tsfsah stfsah aftssh fatssh atfssh tafssh ftassh tfassh afstsh fastsh asftsh saftsh fsatsh sfatsh atsfsh tasfsh astfsh satfsh tsafsh stafsh ftsash tfsash fstash sftash tsfash stfash haftss ahftss hfatss fhatss afhtss fahtss hatfss ahtfss htafss thafss athfss tahfss hftass fhtass htfass thfass fthass tfhass afthss fathss atfhss tafhss ftahss tfahss hafsts ahfsts hfasts fhasts afhsts fahsts hasfts ahsfts hsafts shafts ashfts sahfts hfsats fhsats hsfats shfats fshats sfhats afshts fashts asfhts safhts fsahts sfahts hatsfs ahtsfs htasfs thasfs athsfs tahsfs hastfs ahstfs hsatfs shatfs ashtfs sahtfs htsafs thsafs hstafs shtafs tshafs sthafs atshfs tashfs asthfs sathfs tsahfs stahfs hftsas fhtsas htfsas thfsas fthsas tfhsas hfstas fhstas hsftas shftas fshtas sfhtas htsfas thsfas hstfas shtfas tshfas sthfas ftshas tfshas fsthas sfthas tsfhas stfhas aftshs fatshs atfshs tafshs ftashs tfashs afsths fasths asfths safths fsaths sfaths atsfhs tasfhs astfhs satfhs tsafhs stafhs ftsahs tfsahs fstahs sftahs tsfahs stfahs
Note: these 'words' (valid or invalid) are all the permutations of the word shafts. These words are obtained by scrambling the letters in shafts.