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2. 9a²b² - 24abc + 16c²
3. 4x⁴y² + 20x²y³z + 25y⁴z²
4. y⁴ + 4y²r + 4r²
5. 9x² + 12xy + 4y²
6. a⁴b⁴ + 6a²b² + 9