import java.util.*;
 
public class Main {
 
	public static void main(String[] args) {
 
		List<String> mylist1 = new ArrayList<>();
		List<String> mylist2 = new LinkedList<>();
		List<String> mylist3 = new Vector<>();
 
		Vector<String> vec = new Vector<>();
 
		Queue<String> que = new LinkedList<>();
 
		Stack<String> sta = new Stack<>();
 
		Set<String> myset = new HashSet<>();
		Set<String> myset2 = new TreeSet<>(); // Good
 
		Map<String, Integer> mymap = new HashMap<>(); // Good
		Map<String, Integer> mymap2 = new TreeMap<>();
	}
}