Related vs Unrelated Envelopes

In this Question Line video, Jason answers the following question regarding related and unrelated envelopes: 

What are Unrelated Actual Mating Envelope and Related Actual Mating Envelope?

In this video, Jason defines the terms “related actual mating envelope” and “unrelated actual mating envelope” and walks through a drawing example to explain when and how they are used to inspect a feature. 

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