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(3m - 3n)(3m - 3n)
9m² - 9mn - 9mn + 9n²
(9m² - 18mn + 9n²)(3m - 3n)
27m³ - 27m²n - 54m²n + 54mn² + 27mn² - 27n³
(27m³ - 81m²n + 81mn² - 27n³)(3m - 3n)
81m⁴ - 81m³n - 243m³n + 243m²n² + 243m²n² - 243mn³ - 81mn³ + 81n⁴
81m⁴ - 324m³n + 468m³n - 324mn³ + 81n⁴