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app.py

@@ -107,10 +107,13 @@ def llm_one_sentence(structured: Dict[str, Any]) -> str:
     it would stay in the air for {time_of_flight_s} s, reach {max_height_m} m, travel {range_m} m, and impact at {impact_speed_mps} m/s.
     '''
 
-    user_msg = f"JSON:
-{json.dumps(payload, indent=2)}
-
-Produce the single sentence as specified."
+    user_msg = "
+".join([
+      "JSON:",
+      json.dumps(payload, indent=2),
+      "",
+      "Produce the single sentence as specified."
+  ])
 
     # ✅ Use the tokenizer's chat template
     messages = [