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