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{"qid":"demo-1","query":"What causes the northern lights?","hits":[{"docid":"d1","content":"Auroras occur when charged particles from the solar wind interact with gases in Earth's upper atmosphere.","score":1.0},{"docid":"d2","content":"Clouds form when water vapor cools and condenses into droplets.","score":0.9},{"docid":"d3","content":"Earth's magnetic field guides energetic solar particles toward polar regions, producing auroral light.","score":0.8},{"docid":"d4","content":"The Moon orbits Earth approximately every 27.3 days.","score":0.7}]}