Let P̅ and Q̅ denote the complements of two sets P and Q. Then the set (P - Q) ∪ (Q - P) ∪ (P ∩ Q) is

1
P ∪ Q
2
P̅ ∪ Q̅ 
3
P ∩ Q
4
P̅ ∩ Q̅ 

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