preed rpeed pered epred reped erped preed rpeed pered epred reped erped peerd eperd peerd eperd eeprd eeprd reepd erepd reepd erepd eerpd eerpd prede rpede perde eprde repde erpde prdee rpdee pdree dpree rdpee drpee pedre epdre pdere dpere edpre depre redpe erdpe rdepe drepe edrpe derpe prede rpede perde eprde repde erpde prdee rpdee pdree dpree rdpee drpee pedre epdre pdere dpere edpre depre redpe erdpe rdepe drepe edrpe derpe peedr epedr peedr epedr eepdr eepdr peder epder pdeer dpeer edper deper peder epder pdeer dpeer edper deper eedpr eedpr edepr deepr edepr deepr reedp eredp reedp eredp eerdp eerdp redep erdep rdeep dreep edrep derep redep erdep rdeep dreep edrep derep eedrp eedrp ederp deerp ederp deerp
Note: these 'words' (valid or invalid) are all the permutations of the word preed. These words are obtained by scrambling the letters in preed.