wiper iwper wpier pwier ipwer piwer wiepr iwepr weipr ewipr iewpr eiwpr wpeir pweir wepir ewpir pewir epwir ipewr piewr iepwr eipwr peiwr epiwr wipre iwpre wpire pwire ipwre piwre wirpe iwrpe wripe rwipe irwpe riwpe wprie pwrie wrpie rwpie prwie rpwie iprwe pirwe irpwe ripwe priwe rpiwe wierp iwerp weirp ewirp iewrp eiwrp wirep iwrep wriep rwiep irwep riwep werip ewrip wreip rweip erwip rewip ierwp eirwp irewp riewp eriwp reiwp wperi pweri wepri ewpri pewri epwri wprei pwrei wrpei rwpei prwei rpwei werpi ewrpi wrepi rwepi erwpi rewpi perwi eprwi prewi rpewi erpwi repwi iperw pierw ieprw eiprw peirw epirw iprew pirew irpew ripew priew rpiew ierpw eirpw irepw riepw eripw reipw periw epriw preiw rpeiw erpiw repiw
Note: these 'words' (valid or invalid) are all the permutations of the word wiper. These words are obtained by scrambling the letters in wiper.