File:Stairs and ramps, angles and curves.jpg
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![File:Stairs and ramps, angles and curves.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Stairs_and_ramps%2C_angles_and_curves.jpg/600px-Stairs_and_ramps%2C_angles_and_curves.jpg?20151018212017)
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