Bokstavstärningar
Klara has $N$ dices with letters written on them. Each die has a letter on each of its $K$ sides. By throwing the dice and rearranging them in some arbitrary order, you can make construct a word with $N$ letters.
Write a program to count the number of valid words that can be constructed using Klara’s dice. You will get a wordlist, that contains all the $M$ valid $N$letter words.
Input
The first line of input contains three spaceseparated integers $N$, $K$ and $M$.
The next $N$ lines each describe a die. Line $i$ will contain $K$ letters, the letters on the sides of the $i$:th die.
Finally, there will be $M$ lines, the valid words. Each line will contain an $N$letter word.
All words will only capital letters AZ.
No letter will appear on more than one side of a die.
Output
Your program should print a single integer: the number of valid words that can be written.
Scoring
Your solution will be tested on a number of test case groups. To get points for a group you have to solve all the test cases in that group.
Group 
Points 
Limits 
Other 
1 
9 
$K = 2, N \le 4, M \le 100$ 

2 
9 
$K \le 6, N \le 5, M \le 100$ 

3 
12 
$K \le 20, N \le 6, M \le 1000$ 

4 
14 
$K \le 15, N \le 6, M \le 10\, 000$ 

5 
21 
$K \le 20, N \le 6, M \le 100\, 000$ 

6 
35 
$K \le 10, N \le 13, M \le 500$ 
Sample Input 1  Sample Output 1 

4 3 5 TSU NKT KMO LJA KATT NATT STOL MASK KOST 
3 