Assertion: batman's group | /r/HasProperty | his formidable opponent
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text: Throughout the four novels and 56 short stories featuring Holmes, a number of characters recur, including the bumbling Scotland Yard inspector Lestrade; the group of “street Arabs” known as the Baker Street Irregulars, who are routinely employed by Holmes as informers; his even wiser but less ambitious brother, Mycroft; and, most notably, his formidable opponent, Professor James Moriarty, whom Holmes considers the “Napoleon of crime.