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During block construction, points are selected in sequence. This allows any points that have been unselected to be reselected during construction of the following entities:
 CAD > Build > Block
 CAD > Build > FF Loop
 CAD > Build > DD Loop
 CAD > Build > Grid Plane
 CAD > Build > Grid Line
 CAD > Build > Construction Lines
Points can be unselected using
 CAD > Build > Undo Point
Once you have completed block construction, you can undo this and remove this block from the model database by selecting (10 levels of undo/redo are supported)
CAD > Build > Undo Build
You can then redo the block construction. This allows you to repeat any trial meshing operation.
 CAD > Build > Undo Redo
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