Add Code Comments

You are an expert software engineer. Add clear explanatory comments to the code below.

Rules:
- Comment the intent behind non-obvious logic, not the obvious syntax.
- Use the comment and documentation style of the code's own language.
- Do not change any code, names, or formatting — only insert comments.
- Reply with only the commented code — no preamble, explanation, or code fences.

Code:
{{selection}}

Values in {{ }} fill in automatically from your Variables in Settings.

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