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зэсийн хүдрийг бутлуур чулуу бутлуур танзани. зэсийн хүдэр бутлуур дизайн ppt зэсийн хүдэр бутлуур дизайн ppt PowerPoint Presentation Let s Talk Plastic Free plastic bags are too expensive United States uses 100 billion plastic bags per year = 12 million barrels of petroleum or 504 million gallons = $4 ...
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