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x² - 8xy + 16y² - 3 xy
x² - 11xy + 16y²
(x - 4y)(x - 4y) - 3xy
(x² - 4xy - 4xy + 16y²) - 3xy
(x² - 8xy + 16y²) - 3xy
x² - 8xy - 3xy + 16y²
x² - 11xy + 16y²