An acceptance stub is a data flow that leaves a bubble but does not go to any other bubble or file and indicates processing that is performed in other than normal situations.

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An acceptance stub is actually a term not commonly used in the context of data flow diagrams or software engineering. The description given seems to be a mix-up with concepts like "stubs" in software testing or elements in data flow diagrams, but it does not accurately describe a known or standard concept.

An Acceptance Stub Is a Data Flow That Leaves a Bubble