tngis ntgis tgnis gtnis ngtis gntis tnigs ntigs tings itngs nitgs intgs tgins gtins tigns itgns gitns igtns ngits gnits nigts ingts gints ignts tngsi ntgsi tgnsi gtnsi ngtsi gntsi tnsgi ntsgi tsngi stngi nstgi sntgi tgsni gtsni tsgni stgni gstni sgtni ngsti gnsti nsgti sngti gsnti sgnti tnisg ntisg tinsg itnsg nitsg intsg tnsig ntsig tsnig stnig nstig sntig tisng itsng tsing sting istng sitng nistg instg nsitg snitg isntg sintg tgisn gtisn tigsn itgsn gitsn igtsn tgsin gtsin tsgin stgin gstin sgtin tisgn itsgn tsign stign istgn sitgn gistn igstn gsitn sgitn isgtn sigtn ngist gnist nigst ingst ginst ignst ngsit gnsit nsgit sngit gsnit sgnit nisgt insgt nsigt snigt isngt singt gisnt igsnt gsint sgint isgnt signt
Note: these 'words' (valid or invalid) are all the permutations of the word tngis. These words are obtained by scrambling the letters in tngis.