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Warning: Trying to access array offset on value of type bool in /home/kkwave/lifehackerrrrr.com/public_html/wp-content/themes/simplicity2/header-twitter-card.php on line 45 【画像】この度、東大が解明に成功した「贈与の相互作用」とやらがヤバイ‥‥「返礼ができなければ従属してしまう」「最終的には巨大な権力者が誕生する」