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Fixed Geometry
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Restrains the selected edges or vertices from moving along the two perpendicular directions on the plane. No restraints are applied along the normal direction to the section plane. 
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Fixed Hinge
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Restrains the selected circular edge so that it can rotate about its own axis only.
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Roller/Slider
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Restrains the selected edge from moving along the in-plane normal direction to the edge. 
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