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Symmetry
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Restrains the selected edge from moving along the in-plane normal direction to the edge. This option is similar to the Roller/Slider options. 
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Use Reference Geometry
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Use a reference geometry to apply restraints. The reference can be a face or plane parallel to the section plane, or axis, or to an edge. The table shows the translations and rotations not applicable along certain directions.
| Reference geometry |
Translations |
Rotations |
| Face or plane parallel to section plane |
 - Normal to plane
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 - Along Plane Dir 1
 - Along Plane Dir 2
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| Edge |
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You cannot apply rotations |
| Axis on the section plane |
 - Circumferential
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You cannot apply rotations |
| Axis normal to the section plane (not allowed for the axisymmetric type) |
 - Axial
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 - Radial - Circumferential
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