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(cd)5 - 5 (cd)⁴(2) + 10 (cd)³(2)² - 10 (cd)² (2)³ + 5 (cd)(2)⁴ - 2⁵
(cd)⁵ - 10(cd)⁴ + 40(cd)³ - 80(cd)² + 80(cd) - 32