import sys
from collections import Counter

def winningLotteryTicket(tickets):
    FULL = (1 << 10) - 1 
    freq = Counter()

    for t in tickets:
        mask = 0
        for ch in set(t): 
            mask |= 1 << (ord(ch) - ord('0'))
        freq[mask] += 1

    masks = list(freq.keys())
    masks.sort()

    total = 0
    L = len(masks)
    for i in range(L):
        a = masks[i]
        fa = freq[a]
        if (a | a) == FULL:
            total += fa * (fa - 1) // 2
        for j in range(i+1, L):
            b = masks[j]
            if (a | b) == FULL:
                total += fa * freq[b]

    return total

if __name__ == "__main__":
    data = sys.stdin.read().strip().split()
    if not data:
        print(0)
        sys.exit(0)

    n = int(data[0])
    tickets = data[1:1+n]
    print(winningLotteryTicket(tickets))

long winningLotteryTicket(vector<string> tickets) {
    // A map to store the frequency of each bitmask
    unordered_map<int, long> bitmask_count;
    
    // Process each ticket and compute its bitmask
    for (const string& ticket : tickets) {
        int bitmask = 0;
        
        // Mark the digits that appear in the ticket
        for (char c : ticket) {
            bitmask |= (1 << (c - '0'));
        }
        
        // Increment the count for this bitmask
        bitmask_count[bitmask]++;
    }
    
    long result = 0;
    
    // Now check pairs of bitmasks
    for (auto it1 = bitmask_count.begin(); it1 != bitmask_count.end(); ++it1) {
        for (auto it2 = next(it1); it2 != bitmask_count.end(); ++it2) {
            if ((it1->first | it2->first) == 1023) {
                result += it1->second * it2->second;
            }
        }
    }
    
    // Check the cases where both bitmasks are the same
    for (auto it1 = bitmask_count.begin(); it1 != bitmask_count.end(); ++it1) {
        if ((it1->first | it1->first) == 1023) {
            result += (it1->second * (it1->second - 1)) / 2;
        }
    }

    return result;
}

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();
    }
}