import java.util.*;
 
public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		Map<String, Long>map =  new HashMap<>();
      
      long count = 0;
      for(int i = 0;i < n;i++){
        char[] s= sc.next().toCharArray();
        Arrays.sort(s);
        String key=new String(s);
      if(map.containsKey(key)) {
          count+=map.get(key);
          map.put(key, map.get(key)+1);
      }else{
          map.put(key, (long)1);
        }
      }
      System.out.print(count);
	}
}

/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