pises ipses psies spies ispes sipes piess ipess peiss episs iepss eipss pseis speis pesis epsis sepis espis iseps sieps iesps eisps seips esips pisse ipsse psise spise ispse sipse pisse ipsse psise spise ispse sipse pssie spsie pssie spsie sspie sspie isspe sispe isspe sispe ssipe ssipe piess ipess peiss episs iepss eipss pises ipses psies spies ispes sipes pesis epsis pseis speis espis sepis iesps eisps iseps sieps esips seips psesi spesi pessi epssi sepsi espsi pssei spsei pssei spsei sspei sspei pessi epssi psesi spesi espsi sepsi sespi esspi ssepi ssepi esspi sespi isesp siesp iessp eissp seisp esisp issep sisep issep sisep ssiep ssiep iessp eissp isesp siesp esisp seisp sesip essip sseip sseip essip sesip
Note: these 'words' (valid or invalid) are all the permutations of the word pises. These words are obtained by scrambling the letters in pises.