#include <bits/stdc++.h>
const long long MOD = 1e9 + 7;
using pii = std::pair<long long, long long>;
using namespace std;
const long long maxbit = 24, maxmask = (1 << 24) + 5;
long long n, dp[maxmask] = {0};
string s;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  for (long long i = 0; i < n; i++) {
    cin >> s;
    long long val[3] = {0};
    for (long long i = 0; i < 3; i++) val[i] = (1 << (s[i] - 'a'));
    for (long long i = 0; i < 3; i++) dp[val[i]]++;
    for (long long i = 0; i < 3; i++)
      for (long long j = i + 1; j < 3; j++) dp[val[i] | val[j]]--;
    dp[val[0] | val[1] | val[2]]++;
  }
  for (long long i = 0; i < maxbit; i++)
    for (long long j = 0; j < (1 << maxbit); j++)
      if (j & (1 << i)) dp[j] += dp[j ^ (1 << i)];
  long long ans = 0;
  for (long long i = 0; i < (1 << maxbit); i++) ans ^= (dp[i] * dp[i]);
  cout << ans << "\n";
  return 0;
}
