⊂ - X ⋂ Y = X, then X.....Y, ⊃ - X ⋃ Y = Y, Y.... X, ⋃ - {5}.....{x}={5,x}, ⋂ - X......∅ = ∅, ∈ - If a ∈ X ⋂ Y, then a....X and a...Y, ∉ - If X = {1,2}⋂{1,3}, then 3....X ,

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