#include <bits/stdc++.h>
using namespace std;
using LL = long long;

#define fs first
#define sc second

const LL MOD = 1e9+7;
const double EPS = 1e-10;

template<class T>bool chmax(T &a, const T &b) {
    if (a < b) { a = b; return true; }
    return false;
}
template<class T>bool chmin(T &a, const T &b) {
    if (b < a) { a = b; return true; }
    return false;
}

// input
template<typename T>
void input(T& a) { cin >> a; }
template<typename T,typename... Ts>
void input(T& a,Ts&... ts) {
    input<T>(a);
    input<T>(ts...);
}

// std::vector Declaration
template<typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) {
    return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

// std::vector Initialization
template<typename T>
void fill_all(T& arr, const T& v) { arr = v; }
template<typename T, typename U>
void fill_all(T& arr, const U& v) { for (auto& i : arr) fill_all(i, v); }

// std::vector Input
template<typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for (auto &e : v) {
        is >> e;
    }
    return is;
}

// std::vector Input parallel
template<typename T>
void input_at(size_t idx, T& a) {
    cin >> a[idx];
}
template<typename T, typename... Ts>
void input_at(size_t idx, T& a, Ts&... ts) {
    input_at<T>(idx, a);
    input_at<T>(idx, ts...);
}
template<typename T>
void input_parallel(T& a) {
    for (size_t idx = 0; idx < (size_t)a.size(); ++idx) {
        input_at<T>(idx, a);
    }
}
template<typename T, typename...Ts>
void input_parallel(T& a, Ts&... ts) {
    for (size_t idx = 0; idx < (size_t)a.size(); ++idx) {
        input_at<Ts...>(idx, a, ts...);
    }
}

// std::vector Debug
template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "[";
    bool a = 1;
    for (auto e : v) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::array Debug
template<typename T, size_t n>
ostream& operator<<(ostream& os, const array<T, n>& v) {
    os << "[";
    bool a = 1;
    for (auto e : v) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::deque Debug
template<typename T>
ostream& operator<<(ostream& os, const deque<T>& d) {
    os << "[";
    bool a = 1;
    for (auto e : d) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::pair Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << " " << p.second << ")";
    return os;
}

// std::set Debug
template<typename T>
ostream& operator<<(ostream& os, const set<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::multiset Debug
template<typename T>
ostream& operator<<(ostream& os, const multiset<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::map Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const map<T, U>& mp) {
    os << "{";
    bool a = 1;
    for (auto e : mp) {
        os << (a ? "" : " ");
        os << e.first << ":" << e.second;
        a = 0;
    }
    os << "}";
    return os;
}

// std::tuple Debug
template<int N, class Tuple>
void out(ostream& os, const Tuple& t){}
template<int N, class Tuple, class H, class ...Ts>
void out(ostream& os, const Tuple& t) {
    if (N) os << " ";
    os << get<N>(t);
    out<N+1,Tuple,Ts...>(os, t);
}
template<class ...Ts>
ostream& operator<<(ostream& os, const tuple<Ts...>& t) {
    os << "(";
    out<0,tuple<Ts...>,Ts...>(os, t);
    os << ")";
    return os;
}

// Debug
#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl

// Weighted edge
template<typename T>
struct edge {
    int src, to;
    T cost;

    edge(int to, T cost) : src(-1), to(to), cost(cost) {}
    edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

    edge &operator=(const int &x) {
        to = x;
        return *this;
    }

    operator int() const { return to; }

    friend ostream& operator<<(ostream& os, const edge& e) {
        return os << "(" << e.src << "->" << e.to << ":" << e.cost << ")";
    }
};

template<typename T>
using Edges = vector<edge<T>>;
template<typename T>
using WeightedGraph = vector<Edges<T>>;
using UnWeightedGraph = vector<vector<int>>;
template<typename T>
using MatrixGraph = vector<vector<T>>;

template<typename T>
void dijkstra(
        const WeightedGraph<T> &g,
        vector<T> &dist,
        int s)
{
    const auto INF = numeric_limits<T>::max();
    dist.assign(g.size(), INF);

    using Pi = pair< T, int >;
    priority_queue<Pi, vector<Pi>, greater<Pi>> que;
    dist[s] = 0;
    que.emplace(dist[s], s);
    while(!que.empty()) {
        T cost;
        int idx;
        tie(cost, idx) = que.top();
        que.pop();
        if(dist[idx] < cost) continue;
        for(auto &e : g[idx]) {
            auto next_cost = cost + e.cost;
            if(dist[e.to] <= next_cost) continue;
            dist[e.to] = next_cost;
            que.emplace(dist[e.to], e.to);
        }
    }
}

int main()
{
    while (true) {
        int n; cin >> n;
        if (n == 0) {
            break;
        }
        vector<string> s(n); cin >> s;


        auto cover = make_v<int>(n, n);
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j) {
                for (int k = 0; k <= s[i].size(); ++k) {
                    int m = min(s[j].size(), s[i].size()-k);
                    if (s[i].substr(k,m) == s[j].substr(0,m)) {
                        cover[i][j] = m;
                        break;
                    }
                }
            }
        }

        WeightedGraph<int> G(n * (1<<n)+1);
        for (int i = 0; i < n; ++i) {
            for (int S = 0; S < 1<<n; ++S) {
                if (!(S & (1<<i))) continue;
                for (int j = 0; j < n; ++j) {
                    if (S & (1<<j)) continue;
                    // i, S -> j, S|j
                    if (cover[i][j] == s[j].size()) {
                        G[i*(1<<n)+S].emplace_back(
                                i*(1<<n) + (S|(1<<j)), 0);
                    } else {
                        G[i*(1<<n)+S].emplace_back(
                                j*(1<<n) + (S|(1<<j)), s[j].size()-cover[i][j]);
                    }
                }
            }
        }
        for (int i = 0; i < n; ++i) {
            G[n * (1<<n)].emplace_back(i*(1<<n)+(1<<i), s[i].size());
        }

        int ans = numeric_limits<int>::max();

        vector<int> dist;
        dijkstra(G, dist, n*(1<<n));
        for (int i = 0; i < n; ++i) {
            chmin(ans, dist[i*(1<<n)+(1<<n)-1]);
        }
        cout << ans << endl;
    }

    return 0;
}



Measured memory_bytes: 24096