ypers pyers yeprs eyprs peyrs epyrs ypres pyres yrpes rypes pryes rpyes yerps eyrps yreps ryeps eryps reyps perys eprys preys rpeys erpys repys ypesr pyesr yepsr eypsr peysr epysr ypser pyser ysper syper psyer spyer yespr eyspr ysepr syepr esypr seypr pesyr epsyr pseyr speyr espyr sepyr yprse pyrse yrpse rypse pryse rpyse ypsre pysre yspre sypre psyre spyre yrspe ryspe ysrpe syrpe rsype srype prsye rpsye psrye sprye rspye srpye yersp eyrsp yresp ryesp erysp reysp yesrp eysrp yserp syerp esyrp seyrp yrsep rysep ysrep syrep rsyep sryep ersyp resyp esryp seryp rseyp sreyp persy eprsy presy rpesy erpsy repsy pesry epsry psery spery espry sepry prsey rpsey psrey sprey rspey srpey erspy respy esrpy serpy rsepy srepy
Note: these 'words' (valid or invalid) are all the permutations of the word ypers. These words are obtained by scrambling the letters in ypers.