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Contextual
Object
Flip Horizontally
Flips the selected object or objects on their vertical axes.

Flip Vertically
Flips the selected object or objects on their horizontal axes.

Splines/Lines

Add Point: Adds a new control point to the spline or multiline midway between the selected point and the next point. If no point is selected, the added point will be placed midway between the first point and the second point.
Delete Point: Deletes the selected control point from the spline or multiline.
Tense: Shorten the handles. When the selected point has no handles, this item is deleted.
Loosen: Lengthen the handles. When the selected point has no handles, this menu item changes to Make into Curve.
Make into Line: Remove the handles from the selected point so that the point has no curve information. When the selected point has no handles, this item is disabled.