1. Because triangles are the only rigid structures. 2. And people started renovating their own structures. 3. Excuse me, who built these structures? 4. And you see these structures, this thing we call the Great Wall, 5. So how does nature build its components and structures? 6. This is a robot that can climb structures. 7. Such claims are also made about many famous structures. 8. These are all traditional water structures, 9. And assembling cube-like structures. 10. So you make structures, sub-structures,
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