## Turn 1

1.  **Analyze the Request:**
    *   Task: Answer the question "What warranty applies to a residential customer?"
    *   Constraint: Use *only* the provided sources.
    *   Output format: Answer with a citation like [S1].
    *   Context: Running inside a private home-lab benchmark harness. (Ignore this, just follow instructions).

2.  **Analyze the Sources:**
    *   [S1] The service warranty lasts 24 months for residential customers.
    *   [S2] Commercial customers receive 12 months of warranty.
    *   [S3] Batteries are excluded after 6 months.

3.  **Evaluate the Question against Sources:**
    *   Question: What warranty applies to a residential customer?
    *   Source [S1] explicitly states: "The service warranty lasts 24 months for residential customers."
    *   Source [S2] is about commercial customers.
    *   Source [S3] is about batteries.

4.  **Formulate the Answer:**
    *   The warranty for a residential customer is 24 months.
    *   Include the citation [S1].

5.  **Final Output Generation:**
    *   "The service warranty lasts 24 months for residential customers [S1]." or simply "24 months [S1]." Let's provide a clear, concise answer. "24 months [S1]" is direct and accurate. Let's write a complete sentence for clarity: "The service warranty lasts 24 months [S1]."