Knead a piece of cuboid plasticine with a length of 8cm, a width of 0.5cm, and a height of 2cm to form a cube. What is the length of the sides of the cube?
把一块长8cm、宽0.5cm、高2cm的长方体橡皮泥捏成一个正方体，这个正方体橡皮泥的棱长是多少？
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