Question4393372.java

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

public class Question4393372 {
    public static void main(String [] args) {
        Set<String> combinations = new HashSet<>();
        
        for (int i = 1000;i < 3000;i++) {
            char [] c = String.valueOf(i).toCharArray();
            Arrays.sort(c);
            combinations.add(new String(c));
        }
        
        System.out.println(combinations.size());
    }
}