Combine water, potatoes, carrots, celery, onion, salt and pepper in large kettle. Boil 10-12 minutes. Meanwhile, in small saucepan, make white sauce by melting butter. Add flour and stir until smooth (about 1 minute). Slowly add milk; cook until thickened. Add grated cheese to white sauce; stir until melted. Add white sauce to potato mixture and stir.
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