import java.util.*;
import java.io.*;
public class Main {
 public static void main(String[] args) throws Exception {
   Scanner file = new Scanner(System.in);
   int n = file.nextInt();
   HashMap<ArrayList<Character>, Integer> hm = new HashMap<>();
   long t = 0;
   for (int i = 0; i < n; i++) {
     String s = file.next();
     ArrayList<Character> a = new ArrayList<>();
     for (char c : s.toCharArray()) a.add(c);
     Collections.sort(a);
     if (!hm.containsKey(a)) hm.put(a, 0);
     t += hm.get(a);
     hm.put(a, hm.get(a) + 1);
   }
   System.out.println(t);
 }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz