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There are different ways to exclude a function from code coverage depending on the programming language and the testing framework being used. Some common methods are:

1. Using comments: Adding a special comment above the function with the word "istanbul ignore" or "@exclude" (for example, in JavaScript) will tell the code coverage tool to skip this function during analysis.

2. Using annotations: Some testing frameworks allow the use of annotations or attributes to exclude code from coverage. For example, in Java, the "@IgnoreCoverage" annotation can be added to a method to exclude it from being analyzed by the code coverage tool.

3. Using configuration files: Some code coverage tools allow the configuration of exclusion rules in a specific file (such as ".coveragerc" in Python). This file can specify which files, modules, or functions should be excluded from analysis based on patterns or explicit names.

4. Refactoring the code: In some cases, it may be necessary to refactor the code and split the function into smaller ones that can be tested separately. This can help to isolate the logic that needs to be excluded from coverage and make the testing more efficient.