midsts imdsts mdists dmists idmsts dimsts misdts imsdts msidts smidts ismdts simdts mdsits dmsits msdits smdits dsmits sdmits idsmts dismts isdmts sidmts dsimts sdimts midtss imdtss mditss dmitss idmtss dimtss mitdss imtdss mtidss tmidss itmdss timdss mdtiss dmtiss mtdiss tmdiss dtmiss tdmiss idtmss ditmss itdmss tidmss dtimss tdimss mistds imstds msitds smitds ismtds simtds mitsds imtsds mtisds tmisds itmsds timsds mstids smtids mtsids tmsids stmids tsmids istmds sitmds itsmds tismds stimds tsimds mdstis dmstis msdtis smdtis dsmtis sdmtis mdtsis dmtsis mtdsis tmdsis dtmsis tdmsis mstdis smtdis mtsdis tmsdis stmdis tsmdis dstmis sdtmis dtsmis tdsmis stdmis tsdmis idstms distms isdtms sidtms dsitms sditms idtsms ditsms itdsms tidsms dtisms tdisms istdms sitdms itsdms tisdms stidms tsidms dstims sdtims dtsims tdsims stdims tsdims midsst imdsst mdisst dmisst idmsst dimsst misdst imsdst msidst smidst ismdst simdst mdsist dmsist msdist smdist dsmist sdmist idsmst dismst isdmst sidmst dsimst sdimst midsst imdsst mdisst dmisst idmsst dimsst misdst imsdst msidst smidst ismdst simdst mdsist dmsist msdist smdist dsmist sdmist idsmst dismst isdmst sidmst dsimst sdimst missdt imssdt msisdt smisdt ismsdt simsdt missdt imssdt msisdt smisdt ismsdt simsdt mssidt smsidt mssidt smsidt ssmidt ssmidt issmdt sismdt issmdt sismdt ssimdt ssimdt mdssit dmssit msdsit smdsit dsmsit sdmsit mdssit dmssit msdsit smdsit dsmsit sdmsit mssdit smsdit mssdit smsdit ssmdit ssmdit dssmit sdsmit dssmit sdsmit ssdmit ssdmit idssmt dissmt isdsmt sidsmt dsismt sdismt idssmt dissmt isdsmt sidsmt dsismt sdismt issdmt sisdmt issdmt sisdmt ssidmt ssidmt dssimt sdsimt dssimt sdsimt ssdimt ssdimt midtss imdtss mditss dmitss idmtss dimtss mitdss imtdss mtidss tmidss itmdss timdss mdtiss dmtiss mtdiss tmdiss dtmiss tdmiss idtmss ditmss itdmss tidmss dtimss tdimss midsts imdsts mdists dmists idmsts dimsts misdts imsdts msidts smidts ismdts simdts mdsits dmsits msdits smdits dsmits sdmits idsmts dismts isdmts sidmts dsimts sdimts mitsds imtsds mtisds tmisds itmsds timsds mistds imstds msitds smitds ismtds simtds mtsids tmsids mstids smtids tsmids stmids itsmds tismds istmds sitmds tsimds stimds mdtsis dmtsis mtdsis tmdsis dtmsis tdmsis mdstis dmstis msdtis smdtis dsmtis sdmtis mtsdis tmsdis mstdis smtdis tsmdis stmdis dtsmis tdsmis dstmis sdtmis tsdmis stdmis idtsms ditsms itdsms tidsms dtisms tdisms idstms distms isdtms sidtms dsitms sditms itsdms tisdms istdms sitdms tsidms stidms dtsims tdsims dstims sdtims tsdims stdims mistsd imstsd msitsd smitsd ismtsd simtsd mitssd imtssd mtissd tmissd itmssd timssd mstisd smtisd mtsisd tmsisd stmisd tsmisd istmsd sitmsd itsmsd tismsd stimsd tsimsd misstd imsstd msistd smistd ismstd simstd misstd imsstd msistd smistd ismstd simstd mssitd smsitd mssitd smsitd ssmitd ssmitd issmtd sismtd issmtd sismtd ssimtd ssimtd mitssd imtssd mtissd tmissd itmssd timssd mistsd imstsd msitsd smitsd ismtsd simtsd mtsisd tmsisd mstisd smtisd tsmisd stmisd itsmsd tismsd istmsd sitmsd tsimsd stimsd mstsid smtsid mtssid tmssid stmsid tsmsid msstid smstid msstid smstid ssmtid ssmtid mtssid tmssid mstsid smtsid tsmsid stmsid stsmid tssmid sstmid sstmid tssmid stsmid istsmd sitsmd itssmd tissmd stismd tsismd isstmd sistmd isstmd sistmd ssitmd ssitmd itssmd tissmd istsmd sitsmd tsismd stismd stsimd tssimd sstimd sstimd tssimd stsimd mdstsi dmstsi msdtsi smdtsi dsmtsi sdmtsi mdtssi dmtssi mtdssi tmdssi dtmssi tdmssi mstdsi smtdsi mtsdsi tmsdsi stmdsi tsmdsi dstmsi sdtmsi dtsmsi tdsmsi stdmsi tsdmsi mdssti dmssti msdsti smdsti dsmsti sdmsti mdssti dmssti msdsti smdsti dsmsti sdmsti mssdti smsdti mssdti smsdti ssmdti ssmdti dssmti sdsmti dssmti sdsmti ssdmti ssdmti mdtssi dmtssi mtdssi tmdssi dtmssi tdmssi mdstsi dmstsi msdtsi smdtsi dsmtsi sdmtsi mtsdsi tmsdsi mstdsi smtdsi tsmdsi stmdsi dtsmsi tdsmsi dstmsi sdtmsi tsdmsi stdmsi mstsdi smtsdi mtssdi tmssdi stmsdi tsmsdi msstdi smstdi msstdi smstdi ssmtdi ssmtdi mtssdi tmssdi mstsdi smtsdi tsmsdi stmsdi stsmdi tssmdi sstmdi sstmdi tssmdi stsmdi dstsmi sdtsmi dtssmi tdssmi stdsmi tsdsmi dsstmi sdstmi dsstmi sdstmi ssdtmi ssdtmi dtssmi tdssmi dstsmi sdtsmi tsdsmi stdsmi stsdmi tssdmi sstdmi sstdmi tssdmi stsdmi idstsm distsm isdtsm sidtsm dsitsm sditsm idtssm ditssm itdssm tidssm dtissm tdissm istdsm sitdsm itsdsm tisdsm stidsm tsidsm dstism sdtism dtsism tdsism stdism tsdism idsstm disstm isdstm sidstm dsistm sdistm idsstm disstm isdstm sidstm dsistm sdistm issdtm sisdtm issdtm sisdtm ssidtm ssidtm dssitm sdsitm dssitm sdsitm ssditm ssditm idtssm ditssm itdssm tidssm dtissm tdissm idstsm distsm isdtsm sidtsm dsitsm sditsm itsdsm tisdsm istdsm sitdsm tsidsm stidsm dtsism tdsism dstism sdtism tsdism stdism istsdm sitsdm itssdm tissdm stisdm tsisdm isstdm sistdm isstdm sistdm ssitdm ssitdm itssdm tissdm istsdm sitsdm tsisdm stisdm stsidm tssidm sstidm sstidm tssidm stsidm dstsim sdtsim dtssim tdssim stdsim tsdsim dsstim sdstim dsstim sdstim ssdtim ssdtim dtssim tdssim dstsim sdtsim tsdsim stdsim stsdim tssdim sstdim sstdim tssdim stsdim
Note: these 'words' (valid or invalid) are all the permutations of the word midsts. These words are obtained by scrambling the letters in midsts.