import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        Map<String, Integer> count = new HashMap<>();
        int n = in.nextInt();
        long res = 0;
        for (int i = 0; i < n; i++) {
            String s = sort(in.next());
            res += (count.containsKey(s) ? count.get(s) : 0);
            if (count.containsKey(s)) {
                count.replace(s, count.get(s) + 1);
            } else {
                count.put(s, 1);
            }
        }

        System.out.println(res);
    }

    private static String sort(String text) {
        char[]chars = text.toCharArray();
        Arrays.sort(chars);
        return new String(chars);
    }
}
/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