////////////////////////////////////////
///  tu3 pro-con template            ///
////////////////////////////////////////
#include "bits/stdc++.h"
using namespace std;

// -- loop macros -- //
#define REP(i,n) for (int i = 0; i < (n); i++)
#define RREP(i,n) for (int i = (n)-1; i >= 0; i--)
#define FOR(i,s,n) for (int i = (int)(s); i < (n); i++)
#define RFOR(i,s,n) for (int i = (n)-1; i >= (s); i--)
#define FOREACH(i,container) for (auto &&i : container)
#define allof(c) c.begin(), c.end()
#define partof(c,i,n) c.begin() + (i), c.begin() + (i) + (n)

// -- functors -- //
#define PREDICATE(t,a,exp) [&](const t & a) -> bool { return exp; }
#define COMPARISON(t,a,b,exp) [&](const t & a, const t & b) -> bool { return exp; }

#define PRED(a,exp) [&](const auto & a) -> bool { return exp; }
#define COMP(a,b,exp) [&](const auto & a, const auto & b) -> bool { return exp; }
#define CONV1(a,exp) [&](const auto & a) -> auto { return exp; }
#define CONV2(a,b,exp) [&](const auto & a, const auto & b) -> auto { return exp; }
#define CONV3(a,b,c,exp) [&](const auto & a, const auto & b, const auto & c) -> auto { return exp; }

// -- typedefs -- //
#define EPS 1e-9

typedef unsigned int uint;
typedef long long llong;
typedef unsigned long long ullong;

// -- I/O Helper -- //
struct _Reader { _Reader(istream &cin) :cin(cin) {} istream &cin; template <class T> _Reader operator ,(T &rhs) { cin >> rhs; return *this; } };
struct _Writer { _Writer(ostream &cout) :cout(cout) {} ostream &cout; bool f{ false }; template <class T> _Writer operator ,(const T &rhs) { cout << (f ? " " : "") << rhs; f = true; return *this; } };
#define READ(t,...) t __VA_ARGS__; (_Reader{cin}), __VA_ARGS__
#define WRITE(...) (_Writer{cout}), __VA_ARGS__; cout << '\n'
#define DEBUG(...) (_Writer{cerr}), __VA_ARGS__; cerr << '\n'

// -- vevector -- //
template <class T> struct vevector : public vector<vector<T>> { vevector(size_t n = 0, size_t m = 0, const T &initial = T()) : vector<vector<T>>(n, vector<T>(m, initial)) { } };
template <class T> struct vevevector : public vector<vevector<T>> { vevevector(size_t n = 0, size_t m = 0, size_t l = 0, const T &initial = T()) : vector<vevector<T>>(n, vevector<T>(m, l, initial)) { } };
template <class T> struct vevevevector : public vector<vevevector<T>> { vevevevector(size_t n = 0, size_t m = 0, size_t l = 0, size_t k = 0, const T &initial = T()) : vector<vevevector<T>>(n, vevevector<T>(m, l, k, initial)) { } };

namespace std {
	template <class T1, class T2> inline istream & operator >> (istream & in, pair<T1, T2> &p) { in >> p.first >> p.second; return in; }
	template <class T1, class T2> inline ostream & operator << (ostream &out, const pair<T1, T2> &p) { out << p.first << " " << p.second; return out; }
}

template <class T> T read() { T t; cin >> t; return t; }
template <class T> vector<T> read(int n) { vector<T> v; REP(i, n) { v.push_back(read<T>()); } return v; }
template <class T> vevector<T> read(int n, int m) { vevector<T> v; REP(i, n) v.push_back(read<T>(m)); return v; }
template <class T> vector<T> readjag() { return read<T>(read<int>()); }
template <class T> vevector<T> readjag(int n) { vevector<T> v; REP(i, n) v.push_back(readjag<T>()); return v; }

template <class T> struct iter_pair_t { T beg, end; };
template <class T> iter_pair_t<T> iter_pair(T beg, T end) { return iter_pair_t<T>{beg, end}; }
template <class T> ostream & operator << (ostream &out, iter_pair_t<T> v) { if (v.beg != v.end) { out << *v.beg++; while (v.beg != v.end) { out << " " << *v.beg++; } } return out; }
template <class T1> ostream & operator << (ostream &out, const vector<T1> &v) { return out << iter_pair(begin(v), end(v)); }

// -- etc -- //
template <class T> T infinity_value();
#define DEFINE_INFINITY_VALUE(T, val) template <> constexpr T infinity_value<T>() { return (val); }
DEFINE_INFINITY_VALUE(int, 1 << 28);
DEFINE_INFINITY_VALUE(uint, 1u << 28);
DEFINE_INFINITY_VALUE(llong, 1ll << 60);
DEFINE_INFINITY_VALUE(ullong, 1ull << 60);
DEFINE_INFINITY_VALUE(double, HUGE_VAL);
DEFINE_INFINITY_VALUE(float, HUGE_VAL);
#define INF(T) infinity_value<T>()

inline int sign_of(double x) { return (abs(x) < EPS ? 0 : x > 0 ? 1 : -1); }
template <class TInt> bool in_range(TInt val, TInt min, TInt max) { return val >= min && val < max; }
template <> bool in_range<double>(double val, double min, double max) { return val - min > -EPS && val - max < EPS; }
template <> bool in_range<float>(float val, float min, float max) { return val - min > -EPS && val - max < EPS; }
template <class TInt> bool in_range2d(TInt x, TInt y, TInt w, TInt h) { return x >= 0 && x < w && y >= 0 && y < h; }
vector<int> iotavn(int start, int count) { vector<int> r(count); iota(allof(r), start);	return r; }

//// start up ////
void solve();
int main()
{
	//// for local debugging
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);

	//auto classic_table = ctype<char>::classic_table();
	//vector<ctype<char>::mask> ctable(classic_table, classic_table + ctype<char>::table_size);
	//ctable[':'] |= ctype_base::space; // as delimitor
	//ctable['/'] |= ctype_base::space; // as delimitor
	//cin.imbue(locale(cin.getloc(), new ctype<char>(ctable.data())));

	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	cout << fixed;
	cout << setprecision(std::numeric_limits<double>::max_digits10);
	solve();

	return 0;
}

// compare
template <class InIt1, class InIt2>
int partial_compare(InIt1 first1, InIt1 last1, InIt2 first2, InIt2 last2)
{
	return lexicographical_compare(first1, last1, first2, last2) ? -1
		: lexicographical_compare(first2, last2, first1, last1) ? 1
		: 0;
}

// uint bit permutation
struct BitPermutation
{
#ifdef _MSC_VER
	static uint __builtin_ctz(unsigned int x) { unsigned long r; _BitScanForward(&r, x); return r; }
#endif
	using TVal = uint;
	static int bsf(uint x) { return x ? __builtin_ctz(x) : -1; }

	static TVal next_bit_permutation(TVal x) {
		TVal t = x | (x - 1);
		TVal p = (~t & -~t) - 1;
		return (t + 1) | (p >> (bsf(x) + 1));
	}

	struct it {
		TVal val;
		TVal operator *() const { return val; }
		it& operator ++() { val = next_bit_permutation(val); return *this; }
		bool operator != (it o) const { return val != o.val; }
	};

	it s, e;
	BitPermutation(int n, int k)
		: s{ (TVal(1) << k) - 1 }
		, e{ k > 0 ? TVal(1) << n | ((TVal(1) << (k - 1)) - 1) : next_bit_permutation(0) }
	{
		assert(n >= k);
	}
	it begin() const { return s; }
	it end() const { return e; }
};

// ヘルドカープ (改) // TSP (巡回セールスマン問題)など解ける
// O(N^2 * 2^N) (N<=16くらいまで: N=15で700万 N=16で1677万 N=17で3800万)
// TDistance g: g(i,j, n) で 状態nのときの i -> j へのコストを返すファンクタ (0<=i,j<N)
using TCost = int;
template <class TDistance>
TCost HeldKarp(int N, TDistance g, int start = 0, bool needToReturnStart = false)
{
	vevector<TCost> dp(1 << N, N, INF(TCost));
	dp[1 << start][start] = 0;

	FOR(i, 1, N)
	{
		for (int n : BitPermutation(N, i))
		{
			REP(from, N)
			{
				if (dp[n][from] >= INF(TCost)) { continue; }
				REP(to, N)
				{
					if (n & 1 << to) { continue; }
					int next = n | 1 << to;
					TCost dist = dp[n][from] + g(from, to, n);
					if (dist < dp[next][to])
					{
						dp[next][to] = dist;
					}
				}
			}
		}
	}

	TCost ans = INF(TCost);
	REP(i, N)
	{
		ans = min(ans, dp[(1 << N) - 1][i] + (needToReturnStart ? g(i, start, (1 << N) - 1) : 0));
	}
	return ans;
}
////////////////////
/// template end ///
////////////////////

int getCommonLen(const string&a, string &b)
{
	int N = min(a.size(), b.size());
	int maxMatch = 0;
	REP(i, N + 1)
	{
		if (partial_compare(partof(a, a.size() - i, i), partof(b, 0, i)) == 0)
		{
			maxMatch = i;
		}
	}
	return maxMatch;
}

void solve()
{
	while (true)
	{
		READ(int, N);
		if (!N) { break; }
		auto S = read<string>(N);

		auto X = vector<string>();
		REP(i, N)
		{
			bool orig = true;
			REP(j, N)
			{
				if (i != j)
				{
					if (S[j].find(S[i]) != string::npos)
					{
						orig = false;
						break;
					}
				}
			}
			if (orig) { X.push_back(S[i]); }
		}
		S.swap(X); N = S.size();

		vevector<int> g(N + 1, N + 1, INF(int));
		REP(i, N) REP(j, N) g[i][j] = S[j].size() - getCommonLen(S[i], S[j]);
		REP(i, N) g[N][i] = S[i].size();
		int minLen = HeldKarp(N + 1, [&g](auto i, auto j, auto n) { return g[i][j]; }, N, false);
		
		WRITE(minLen);
	}


}



Measured memory_bytes: 6352