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1. In 10-inch nonstick skillet, cook beef over medium-high heat 6 to 7 minutes, stirring frequently, until thoroughly cooked; drain.
2. Stir in water and taco seasoning mix; heat to boiling. Reduce heat; simmer uncovered 3 to 4 minutes, stirring frequently, until thickened.
3. Divide warm beef mixture among heated taco shells. Top with cheese, lettuce, corn, onion, guacamole and cilantro. Serve with lime wedges