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