/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
class collection1{
public static void main
(String[]args
){ c.add(10);
c.add("abc");
l.add(20);
l.add("abc");
l.add(30);
c.addAll(l);
c.removeAll(l);
}
}
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