stems tsems setms estms tesms etsms stmes tsmes smtes mstes tmses mtses semts esmts smets msets emsts mests temss etmss tmess mtess emtss metss stesm tsesm setsm estsm tessm etssm stsem tssem sstem sstem tssem stsem sestm esstm ssetm ssetm esstm sestm tessm etssm tsesm stesm estsm setsm stmse tsmse smtse mstse tmsse mtsse stsme tssme sstme sstme tssme stsme smste msste ssmte ssmte msste smste tmsse mtsse tsmse stmse mstse smtse semst esmst smest msest emsst messt sesmt essmt ssemt ssemt essmt sesmt smset msset ssmet ssmet msset smset emsst messt esmst semst msest smest temss etmss tmess mtess emtss metss tesms etsms tsems stems estms setms tmses mtses tsmes stmes mstes smtes emsts mests esmts semts msets smets
Note: these 'words' (valid or invalid) are all the permutations of the word stems. These words are obtained by scrambling the letters in stems.