Adding and removing of sets elements in Swift
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var set: Set<Character> = ["A", "B", "C"]
set.insert("D")
//set is ["A", "B", "C", "D"]
set.remove("A")
//set is ["B", "C", "D"]
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var set: Set<Character> = ["A", "B", "C"]
set.insert("D")
//set is ["A", "B", "C", "D"]
set.remove("A")
//set is ["B", "C", "D"]