seirs esirs siers isers eisrs iesrs seris esris sreis rseis ersis resis sires isres sries rsies irses rises eirss ierss eriss reiss iress riess seisr esisr siesr isesr eissr iessr sesir essir sseir sseir essir sesir siser isser ssier ssier isser siser eissr iessr esisr seisr isesr siesr sersi esrsi sresi rsesi erssi ressi sesri essri sseri sseri essri sesri srsei rssei ssrei ssrei rssei srsei erssi ressi esrsi sersi rsesi sresi sirse isrse srise rsise irsse risse sisre issre ssire ssire issre sisre srsie rssie ssrie ssrie rssie srsie irsse risse isrse sirse rsise srise eirss ierss eriss reiss iress riess eisrs iesrs esirs seirs isers siers ersis resis esris seris rseis sreis irses rises isres sires rsies sries
Note: these 'words' (valid or invalid) are all the permutations of the word seirs. These words are obtained by scrambling the letters in seirs.