#include <stdio.h>
#include <cmath>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
typedef long long int ll;
#define BIG_NUM 2000000000
#define MOD 1000000007
#define EPS 0.000001
using namespace std;

struct Info{
	char name[21];
	int length;
};

void strcpy(char* to,char* str){
	for(int i=0;str[i] != '\0';i++){
		to[i] = str[i];
		to[i+1] = '\0';
	}
}

int main(){

	int N,cost[14][14],limit,count,tmp,ans,next_state,num_town;
	int** dp = new int*[14]; //dp[????????????][??¶???] = ????°??????????
	for(int i = 0; i < 14; i++){
		dp[i] = new int[16384];
	}

	Info first_info[14],info[14];
	bool FLG,part_sentence[14],update[14][16384];

	while(true){
		scanf("%d",&N);
		if(N == 0)break;

		for(int i = 0; i < N; i++){
			scanf("%s",first_info[i].name);
			for(first_info[i].length = 0; first_info[i].name[first_info[i].length] != '\0';first_info[i].length++);
		}

		for(int i = 0; i < 14;i++)part_sentence[i] = false;

		for(int i = 0; i < N; i++){
			for(int k = 0; k < N; k++){
				if(i != k && first_info[i].length <= first_info[k].length){
					for(int left = 0; first_info[k].length-left >= first_info[i].length;left++){
						FLG = true;

						for(int a = 0; a < first_info[i].length; a++){
							if(first_info[i].name[a] != first_info[k].name[left+a]){
								FLG = false;
								break;
							}
						}

						if(FLG){
							part_sentence[i] = true;
							break;
						}
					}

				}
			}
		}

		num_town = 0;

		for(int i = 0; i < N; i++){
			if(part_sentence[i] == false){
				strcpy(info[num_town].name,first_info[i].name);
				info[num_town].length = first_info[i].length;
				num_town++;
			}
		}

		N = num_town;

		for(int i = 0; i < N; i++){
			for(int k = 0; k < N; k++){
				if(i == k)continue;

				count = 0;

				for(int left = 0; left < info[i].length;left++){
					FLG = true;
					for(int a = left; a < info[i].length && (a-left) < info[k].length;a++){
						if(info[i].name[a] != info[k].name[a-left]){
							FLG = false;
							break;
						}
					}
					if(FLG){
						count = info[i].length-left;
						break;
					}
				}

				cost[i][k] = count;
			}
		}

		limit = pow(2,N);

		for(int i = 0; i < N;i++){
			for(int k = 0; k < limit; k++){
				dp[i][k] = BIG_NUM;
				update[i][k] = false;
			}
		}

		for(int i = 0; i < N; i++){
			tmp = pow(2,i);
			dp[i][tmp] = info[i].length;
			update[i][tmp] = true;
		}

		for(int loop = 0; loop <= N-1; loop++){ //dp?????????????????´??°???????????°???????????? <??¢?????????1????¨??????????????????§????????¨N-1???????????°??????>
			for(int k = 0; k < N; k++){ //????????????????????????
				for(int state = 0; state < limit; state++){
					if(dp[k][state] == BIG_NUM || update[k][state] == false)continue;
					update[k][state] = false;

					for(int a = 0; a < N; a++){
						if(state & (1 << a)){
							//Do nothing
						}else{
							next_state = state + pow(2,a);

							if(dp[a][next_state] > dp[k][state] + info[a].length - cost[k][a]){
								dp[a][next_state] = dp[k][state] + info[a].length - cost[k][a];
								update[a][next_state] = true;
							}
						}
					}
				}
			}
		}

		ans = BIG_NUM;
		for(int i = 0; i < N; i++){
			ans = min(ans,dp[i][limit-1]);
		}

		printf("%d\n",ans);
	}

	return 0;
}

Measured memory_bytes: 3888