import java.util.*;
import java.lang.*;
class Main
{
{
HashSet<Integer> set1 = new HashSet<Integer>();
set1.add(2);
set1.add(4);
set1.add(8);
set1.add(9);
HashSet<Integer> set2 = new HashSet<Integer>();
set2.add(2);
set2.add(6);
set2.add(8);
set2.add(9);
HashSet<Integer> set3 = new HashSet<Integer>();
set3.add(2);
set3.add(4);
set3.add(8);
set3.add(9);
set1.removeAll(set2);
set1.removeAll(set3);
}
}
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