midst imdst mdist dmist idmst dimst misdt imsdt msidt smidt ismdt simdt mdsit dmsit msdit smdit dsmit sdmit idsmt dismt isdmt sidmt dsimt sdimt midts imdts mdits dmits idmts dimts mitds imtds mtids tmids itmds timds mdtis dmtis mtdis tmdis dtmis tdmis idtms ditms itdms tidms dtims tdims mistd imstd msitd smitd ismtd simtd mitsd imtsd mtisd tmisd itmsd timsd mstid smtid mtsid tmsid stmid tsmid istmd sitmd itsmd tismd stimd tsimd mdsti dmsti msdti smdti dsmti sdmti mdtsi dmtsi mtdsi tmdsi dtmsi tdmsi mstdi smtdi mtsdi tmsdi stmdi tsmdi dstmi sdtmi dtsmi tdsmi stdmi tsdmi idstm distm isdtm sidtm dsitm sditm idtsm ditsm itdsm tidsm dtism tdism istdm sitdm itsdm tisdm stidm tsidm dstim sdtim dtsim tdsim stdim tsdim
Note: these 'words' (valid or invalid) are all the permutations of the word midst. These words are obtained by scrambling the letters in midst.