opera poera oepra eopra peora epora oprea porea orpea ropea proea rpoea oerpa eorpa orepa roepa eropa reopa peroa eproa preoa rpeoa erpoa repoa opear poear oepar eopar peoar epoar opaer poaer oaper aoper paoer apoer oeapr eoapr oaepr aoepr eaopr aeopr peaor epaor paeor apeor eapor aepor oprae porae orpae ropae proae rpoae opare poare oapre aopre paore apore orape roape oarpe aorpe raope arope praoe rpaoe paroe aproe rapoe arpoe oerap eorap oreap roeap eroap reoap oearp eoarp oaerp aoerp eaorp aeorp oraep roaep oarep aorep raoep aroep eraop reaop earop aerop raeop areop perao eprao preao rpeao erpao repao pearo eparo paero apero eapro aepro praeo rpaeo pareo apreo rapeo arpeo erapo reapo earpo aerpo raepo arepo
Note: these 'words' (valid or invalid) are all the permutations of the word opera. These words are obtained by scrambling the letters in opera.