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On June 20th, the coal stock market weakened at the beginning, and China Coal Energy led the decline. However, since last year, Buffett has been adding positions to Chevron. According to the latest report data, Berkshire increased its positions of Chevron by 120 million shares to 159 million shares in the first quarter, with a market value of USD 25.919 billion, accounting for 7% of Berkshire's total market value in the first quar...