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type A = keyof (T | U);
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type B = keyof (X & Y);
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type C = keyof T | U;
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type D = keyof X & Y;
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type E = (keyof T)[];
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type F = ((keyof T))[];
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type G = (keyof T1)["foo"];
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type H = ((keyof T1))["foo"];
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type I = (((keyof T1)))["foo"];
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type J = ((((keyof T1))))["foo"];
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