import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		List<String> list = new ArrayList<>();
		for(int i=0;i<N;i++){
			String str = sc.next();
			char[] chars = str.toCharArray();
			Arrays.sort(chars);
			String sortedStr = new String(chars);
			list.add(sortedStr);
		}
		Collections.sort(list);
		String tmp = list.get(0);
		long sum = 0;
		long count = 1;
		for(int i=1;i<N;i++){
			if(tmp.equals(list.get(i))){
				sum += count++;
			}
			else{
				count = 1;
			} 
			tmp = list.get(i);
		}
		System.out.println(sum);
	}
}
/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