With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Dark Knight is dedicated to the legacy of Ledger.
text_B: Arnica lessingii is a Russian and North American species of arnica in the sunflower family .. Arnica. Arnica. arnica. arnica. sunflower family. Asteraceae. Common name is nodding arnica .. arnica. arnica. It is found on both sides of the Bering Strait , being native to Alaska , Yukon , British Columbia , Northwest Territories , and the Kamchatka Peninsula of the Pacific Coast of Russia .. Russia. Russia. Bering Strait. Bering Strait. Alaska. Alaska. Yukon. Yukon. British Columbia. British Columbia. Northwest Territories. Northwest Territories. Kamchatka Peninsula. Kamchatka Peninsula. Pacific Coast. Pacific Ocean
not_related.