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If coefficients of x20{ x }^{ 20 }x20 in (1−x+x2)20{ (1-x+{ x }^{ 2 }) }^{ 20 }(1−x+x2)20 and in (1+x−x2)20{ (1+x-{ x }^{ 2 }) }^{ 20 }(1+x−x2)20 are respectively aaa and bbb, then:
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