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