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Used old frame from metal pipes, painted with green paint, bottom. On isolated white background.
Strips from exclusive wood with painted metallic brown paint, horizontal, - short size. On isolated white background.
Steel pipes for introducing cables pulled through quadratic reinforcement mesh placed for strength bridge skeleton at construction site. Pile of painted wooden molds is in background.
Illustration circle in quadrate design element
Difference of squares formula written on whiteboard — factoring identity shown with marker

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