Use 8 cubes with a side length of 2 cm to form a large cuboid or cube. What shape should be assembled to minimize the sum of the side lengths? What is the side length?
用8个棱长2厘米的正方体拼成一个大长方体或正方体，要使棱长之和最小应拼成什么形状，棱长是多少？
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