import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'winningLotteryTicket' function below.
     *
     * The function is expected to return a LONG_INTEGER.
     * The function accepts STRING_ARRAY tickets as parameter.
     */

    public static long winningLotteryTicket(List<String> tickets) {
        // Write your code here
        long[] freq = new long[1024]; 
        long answer = 0;

        for (String s : tickets) {
            int output = Freq_to_Decimal(s); 
            freq[output]++;
        }
        for (int i = 0; i < 1024; i++) {
            for (int j = i; j < 1024; j++) {
                if ((i | j) == 1023) {
                    if (i == j) {
                        answer += (freq[i] * (freq[i] - 1)) / 2;
                    } else {
                        answer += freq[i] * freq[j];
                    }
                }
            }
        }

        return answer;
    }
    static int Freq_to_Decimal(String s) {
        int ans = 0;
        for (char c : s.toCharArray()) {
            int bit = c - '0'; 
            ans = ans | (1 << (9 - bit)); 
        }
        return ans;
    }
}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(System.out));

        int n = Integer.parseInt(bufferedReader.readLine().trim()); 

        List<String> tickets = IntStream.range(0, n).mapToObj(i -> {
            try {
                return bufferedReader.readLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        })
        .collect(toList()); 
        long result = Result.winningLotteryTicket(tickets); 

        bufferedWriter.write(String.valueOf(result)); 
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}