piper ipper ppier ppier ipper piper piepr ipepr peipr epipr ieppr eippr ppeir ppeir pepir eppir pepir eppir ipepr piepr ieppr eippr peipr epipr pipre ippre ppire ppire ippre pipre pirpe iprpe pripe rpipe irppe rippe pprie pprie prpie rppie prpie rppie iprpe pirpe irppe rippe pripe rpipe pierp iperp peirp epirp ieprp eiprp pirep iprep priep rpiep irpep ripep perip eprip preip rpeip erpip repip ierpp eirpp irepp riepp eripp reipp pperi pperi pepri eppri pepri eppri pprei pprei prpei rppei prpei rppei perpi eprpi prepi rpepi erppi reppi perpi eprpi prepi rpepi erppi reppi iperp pierp ieprp eiprp peirp epirp iprep pirep irpep ripep priep rpiep ierpp eirpp irepp riepp eripp reipp perip eprip preip rpeip erpip repip
Note: these 'words' (valid or invalid) are all the permutations of the word piper. These words are obtained by scrambling the letters in piper.