// @author godmar
// slow I/O
import java.util.*;

public class fairytale_godmar
{
    public static void main(String []av) {
        var sc = new Scanner(System.in);
        int T = sc.nextInt();
        for (int i = 0; i < T; i++) {
            int k = sc.nextInt();
            int [] s = new int[4];
            for (int j = 0; j < k; j++) {
                int pi = sc.nextInt();
                s[(pi-1)/10] |= 1;
            }
            System.out.println(Arrays.stream(s).sum());
        }
    }
}