renob ernob rneob nreob enrob nerob reonb eronb roenb orenb eornb oernb rnoeb nroeb roneb orneb noreb onreb enorb neorb eonrb oenrb noerb onerb renbo ernbo rnebo nrebo enrbo nerbo rebno erbno rbeno breno ebrno berno rnbeo nrbeo rbneo brneo nbreo bnreo enbro nebro ebnro benro nbero bnero reobn erobn roebn orebn eorbn oerbn rebon erbon rbeon breon ebron beron roben orben rboen broen obren boren eobrn oebrn eborn beorn obern boern rnobe nrobe ronbe ornbe norbe onrbe rnboe nrboe rbnoe brnoe nbroe bnroe robne orbne rbone brone obrne borne nobre onbre nbore bnore obnre bonre enobr neobr eonbr oenbr noebr onebr enbor nebor ebnor benor nbeor bneor eobnr oebnr ebonr beonr obenr boenr nober onber nboer bnoer obner boner
Note: these 'words' (valid or invalid) are all the permutations of the word renob. These words are obtained by scrambling the letters in renob.