iberk bierk iebrk eibrk beirk ebirk ibrek birek irbek ribek briek rbiek ierbk eirbk irebk riebk eribk reibk berik ebrik breik rbeik erbik rebik ibekr biekr iebkr eibkr beikr ebikr ibker biker ikber kiber bkier kbier iekbr eikbr ikebr kiebr ekibr keibr bekir ebkir bkeir kbeir ekbir kebir ibrke birke irbke ribke brike rbike ibkre bikre ikbre kibre bkire kbire irkbe rikbe ikrbe kirbe rkibe kribe brkie rbkie bkrie kbrie rkbie krbie ierkb eirkb irekb riekb erikb reikb iekrb eikrb ikerb kierb ekirb keirb irkeb rikeb ikreb kireb rkieb krieb erkib rekib ekrib kerib rkeib kreib berki ebrki breki rbeki erbki rebki bekri ebkri bkeri kberi ekbri kebri brkei rbkei bkrei kbrei rkbei krbei erkbi rekbi ekrbi kerbi rkebi krebi
Note: these 'words' (valid or invalid) are all the permutations of the word iberk. These words are obtained by scrambling the letters in iberk.