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import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Main {
public static void main(String args[]) throws Exception {
List<String> list = new ArrayList<String>();
list.add("A");
list.add("B");
list.add("C");
list = Collections.unmodifiableList(list);
list.add(1, "G");
System.out.println(list);
}
}
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