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PLACE potatoes in large bowl; set aside.
COOK and stir bacon in skillet on medium heat to desired crispness. Remove bacon from skillet; drain, reserving 2 Tbsp. drippings in skillet. Set bacon aside.
ADD onion and celery to skillet; cook and stir until celery is crisp-tender. Blend in flour. Stir in water, vinegar, sugar, salt, pepper and bacon. Bring to boil. Cook on medium heat 5 minutes or until thickened, stirring occasionally. Pour over potatoes; mix lightly. Serve warm.