
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        String[] s = new String[n];
        for(int i=0;i<n;i++){
            s[i] = sc.next();
        }
        Map<List<String>, Integer> codes = new HashMap<>();
        long count = 0;
        for(int i=0;i<n;i++){
            String[] st = s[i].split("");
            Arrays.sort(st);
            List<String> str = Arrays.asList(st);
            if(codes.containsKey(str)){
                int tmp = codes.get(str);
                count += (long)tmp;
                codes.put(str, tmp+1);
            }
            else{
                codes.put(str, 1);
            }
        }
        System.out.println(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