reyup eryup ryeup yreup eyrup yerup reuyp eruyp rueyp ureyp euryp ueryp ryuep yruep ruyep uryep yurep uyrep eyurp yeurp euyrp ueyrp yuerp uyerp reypu erypu ryepu yrepu eyrpu yerpu repyu erpyu rpeyu preyu epryu peryu rypeu yrpeu rpyeu pryeu ypreu pyreu eypru yepru epyru peyru yperu pyeru reupy erupy ruepy urepy eurpy uerpy repuy erpuy rpeuy preuy epruy peruy rupey urpey rpuey pruey uprey purey eupry uepry epury peury upery puery ryupe yrupe ruype urype yurpe uyrpe rypue yrpue rpyue pryue yprue pyrue rupye urpye rpuye pruye uprye purye yupre uypre ypure pyure upyre puyre eyupr yeupr euypr ueypr yuepr uyepr eypur yepur epyur peyur ypeur pyeur eupyr uepyr epuyr peuyr upeyr pueyr yuper uyper ypuer pyuer upyer puyer
Note: these 'words' (valid or invalid) are all the permutations of the word reyup. These words are obtained by scrambling the letters in reyup.