reabt erabt raebt arebt earbt aerbt rebat erbat rbeat breat ebrat berat rabet arbet rbaet braet abret baret eabrt aebrt ebart beart abert baert reatb eratb raetb aretb eartb aertb retab ertab rteab treab etrab terab rateb arteb rtaeb traeb atreb tareb eatrb aetrb etarb tearb aterb taerb rebta erbta rbeta breta ebrta berta retba ertba rteba treba etrba terba rbtea brtea rtbea trbea btrea tbrea ebtra betra etbra tebra btera tbera rabte arbte rbate brate abrte barte ratbe artbe rtabe trabe atrbe tarbe rbtae brtae rtbae trbae btrae tbrae abtre batre atbre tabre btare tbare eabtr aebtr ebatr beatr abetr baetr eatbr aetbr etabr teabr atebr taebr ebtar betar etbar tebar btear tbear abter bater atber taber btaer tbaer
Note: these 'words' (valid or invalid) are all the permutations of the word reabt. These words are obtained by scrambling the letters in reabt.