To determine which net can be folded into a cube, we need to visualize how each arrangement of squares would come together to form a 3-dimensional shape.
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First Illustration: This net has a configuration that can fold into a cube. It has 6 squares arranged in a manner that allows for all sides to come together.
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Second Illustration: This arrangement does not form a cube when folded. The layout would not allow the squares to connect in a way that creates a closed 3-dimensional shape.
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Third Illustration: This net is a classic arrangement of 6 squares (also known as the T-shape) that can definitely fold into a cube.
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Fourth Illustration: This does not allow for a cube to be formed, as the way the squares are positioned would not allow all sides to come together in a cube-like structure.
Based on this analysis, the first and third illustrations show nets that can be folded into a cube. The third illustration clearly illustrates the classic cube net.