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- (x + 2)² + (y + 3) ² + (z – 6) ² = 4
- (x - 2)² + (y - 3) ² + (z + 6) ² = 4
- (x - 2)² + (y - 3) ² + (z + 6) ² = 16
- (x + 2)² + (y + 3) ² + (z – 6) ² = 16