#include <bits/stdc++.h>

using namespace std;

template <ranges::range T,
          class = enable_if_t<!is_convertible_v<T, string_view>>>
istream &operator>>(istream &s, T &&v) {
    for (auto &&x : v)
        s >> x;
    return s;
}
template <ranges::range T,
          class = enable_if_t<!is_convertible_v<T, string_view>>>
ostream &operator<<(ostream &s, T &&v) {
    for (auto &&x : v)
        s << x << ' ';
    return s;
}

#ifdef LOCAL
template <class... T> void dbg(T... x) {
    char e{};
    ((cerr << e << x, e = ' '), ...);
}
#define debug(x...) dbg(#x, '=', x, '\n')
#else
#define debug(...) ((void)0)
#endif

#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define ff first
#define ss second

template <class T> inline constexpr T inf = numeric_limits<T>::max() / 2;
template <class T> bool chmin(T &a, T b) { return (b < a and (a = b, true)); }
template <class T> bool chmax(T &a, T b) { return (a < b and (a = b, true)); }

using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
using i128 = __int128;

// constexpr i64 mod = 1e9 + 7;

void solve() {
    int n;
    cin >> n;

    vector<string> S(n);
    cin >> S;

    int ans = 0;
    for (int k = 0; k + 1 < 20; k++) {
        map<pair<string, int>, int> cnt;
        
        for (int i = 0; i < n; i++)
            for (int j = i + 1; j < n; j++) {
                if (S[i].size() != S[j].size() or k + 1 >= S[i].size())
                    continue;

                if (S[i].substr(0, k) == S[j].substr(0, k) and S[i].substr(k + 2) == S[j].substr(k + 2)) {
                    string a = S[i].substr(k, 2);
                    string b = S[j].substr(k, 2);
                    if (a[0] != b[0] and a[1] != b[1]) {
                        cnt[{a + b, S[i].size()}]++;
                    }
                }
            }
        for (auto &[a, b] : cnt)
            if (b == 1) {
                ans++;
            }
    }

    cout << ans << '\n';
}

signed main() {
    cin.tie(0)->sync_with_stdio(false);
    cin.exceptions(cin.failbit);

    int t = 1;
    // cin >> t;

    while (t--) {
        solve();
    }
    
    return 0;
}