riper irper rpier prier iprer pirer riepr irepr reipr eripr ierpr eirpr rpeir preir repir erpir perir eprir iperr pierr ieprr eiprr peirr epirr ripre irpre rpire prire iprre pirre rirpe irrpe rripe rripe irrpe rirpe rprie prrie rrpie rrpie prrie rprie iprre pirre irpre ripre prire rpire rierp irerp reirp erirp ierrp eirrp rirep irrep rriep rriep irrep rirep rerip errip rreip rreip errip rerip ierrp eirrp irerp rierp erirp reirp rperi preri repri erpri perri eprri rprei prrei rrpei rrpei prrei rprei rerpi errpi rrepi rrepi errpi rerpi perri eprri preri rperi erpri repri iperr pierr ieprr eiprr peirr epirr iprer pirer irper riper prier rpier ierpr eirpr irepr riepr eripr reipr perir eprir preir rpeir erpir repir
Note: these 'words' (valid or invalid) are all the permutations of the word riper. These words are obtained by scrambling the letters in riper.