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import java.util.Set;

import java.util.TreeSet;

public class setDemo1 {

Set<String> set = new TreeSet<>();

public static void main(String[] args) {

setDemo1 setDemo1 = new setDemo1();

setDemo1.set.add("A");

setDemo1.set.add("a");

setDemo1.set.add("B");

setDemo1.set.add("b");

System.out.println(setDemo1.set);

}

}