Does someone know why it is not working? 
package com.codegym.task.task08.task0814;

import java.util.HashSet;
import java.util.Set;

/*
Greater than 10? You're not a good fit for us

*/

public class Solution {
    public static HashSet<Integer> createSet() {
        // write your code here
        Set<Integer> hs = new HashSet<Integer>();

        for(int i = 0; i < 20; i++){
            hs.add(i);
        }
        return (HashSet)hs;
    }

    public static HashSet<Integer> removeAllNumbersGreaterThan10(HashSet<Integer> set) {
        // write your code here
        Set<Integer> gg = set;
        for(int h : gg){
            if(h > 10){
                gg.remove(h);
            }
        }
        return (HashSet)gg;
    }

    public static void main(String[] args) {

    }
}