To make a cuboid iron chimney with 15 sections, each section is 2 meters long, 4 decimeters wide, and 3 decimeters high, how many square meters of iron sheet should be used at least?
要制作15节长方体的铁皮烟囱，每节长2米，宽4分米，高3分米，至少要用多少平方米的铁皮？
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