/* package whatever; // don't place package name! */
 
import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
 
class Ideone {
	public static void main (String[] args) throws java.lang.Exception {
		String s = "w ww www wwww wwwww wwwwwww wwwwww";
        Pattern p = Pattern.compile("\\b\\w{3,5}\\b");
        Matcher m = p.matcher(s);
        int matches = 0;
        while (m.find()){
            matches++;
        }
        if (matches % 2 == 1) {
            matches--;
        }
        m.reset();
        StringBuffer ss = new StringBuffer();
        int counter = 0;
        while (counter++ < matches && m.find()){
            m.appendReplacement(ss, "");
        }
        m.appendTail(ss);
        System.out.println(ss.toString());
	}
}

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