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A parallel constrained is inferred when you touch a line that does not
share endpoints with the line you are currently trying to create, and then
moving your mouse in a direction roughly parallel to that line. Your line
will be adjusted to be parallel to the touched (referenced) line and you
will see a red horizontal line symbol on both the line being created and
the touched line.
Sketch Constraints
When you are editing a Sketch entity on page 172, some constraints inferred at
the time you created the entity are recomputed to aid in editing the entity.
See Sketch Inferencing on page 162 to learn more about the types of inferences.
These temporary constraints work together, so that editing one entity can
affect many other entities. The following list considers each inference described
in the Sketch Inferencing section and discusses whether the inference will
produce a constraint at edit time or not.
Coincident Point Inference
Sketch | 169