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A 10-year-old boy weighing 32 kg is admitted to the ward for observation after an appendicectomy. He is comfortable, normotensive and well perfused, has not vomited, and is to stay nil by mouth overnight. His serum sodium is 139 mmol/L (135-145), potassium 4.1 mmol/L and creatinine normal, and he passed urine in recovery. You are asked to chart his overnight intravenous fluid. Which one of the following orders should you write?
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