import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone {
 
	public static void main (String[] args) {
		String text = "Hello, my identification is Mister Dude.";
		String[] words = text.replaceAll("[^(\\w )]+", "").toLowerCase().split(" ");
		for (String word : words) {
			if (word.length() <= 4) {
				System.out.println(word);
			} 
			else {
				for (int i = 0; i <= word.length() - 4; i++) {
					System.out.println(word.substring(i, i + 4));
				}
			}
		}
	}
}

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