// Java solution for problem F
// Author: Grzegorz Gutowski

import java.io.*;
import java.util.*;

public class f {

public static int solve(char[][] board, int x, int y) {
    int result = 0;
    if (x>=2 && y>=2 && board[x-1][y-1] == 'B' && board[x-2][y-2] == '#') {
        board[x][y] = '#';
        board[x-1][y-1] = '#';
        board[x-2][y-2] = 'W';
        int score = 1 + solve(board, x-2, y-2);
        board[x][y] = 'W';
        board[x-1][y-1] = 'B';
        board[x-2][y-2] = '#';
        if (score > result)
            result = score;
    }
    if (x<=7 && y<=7 && board[x+1][y+1] == 'B' && board[x+2][y+2] == '#') {
        board[x][y] = '#';
        board[x+1][y+1] = '#';
        board[x+2][y+2] = 'W';
        int score = 1 + solve(board, x+2, y+2);
        board[x][y] = 'W';
        board[x+1][y+1] = 'B';
        board[x+2][y+2] = '#';
        if (score > result)
            result = score;
    }
    if (x<=7 && y>=2 && board[x+1][y-1] == 'B' && board[x+2][y-2] == '#') {
        board[x][y] = '#';
        board[x+1][y-1] = '#';
        board[x+2][y-2] = 'W';
        int score = 1 + solve(board, x+2, y-2);
        board[x][y] = 'W';
        board[x+1][y-1] = 'B';
        board[x+2][y-2] = '#';
        if (score > result)
            result = score;
    }
    if (x>=2 && y<=7 && board[x-1][y+1] == 'B' && board[x-2][y+2] == '#') {
        board[x][y] = '#';
        board[x-1][y+1] = '#';
        board[x-2][y+2] = 'W';
        int score = 1 + solve(board, x-2, y+2);
        board[x][y] = 'W';
        board[x-1][y+1] = 'B';
        board[x-2][y+2] = '#';
        if (score > result)
            result = score;
    }
    return result;
}

public static int solve(char[][] board) {
    int result = 0;
    for (int x=0; x<10; x++)
        for (int y=0; y<10; y++)
            if (board[x][y] == 'W') {
                int score = solve(board, x, y);
                if (score > result)
                    result = score;
            }
    return result;
}

public static void main(String[] args) throws IOException {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); 
    int z = Integer.parseInt(reader.readLine());
    while (z-- > 0) {
        reader.readLine();
        char board[][] = new char[10][10];
        for (int i=0; i<10; i++) {
            String line = reader.readLine();
            for (int j=0; j<10; j++)
                board[i][j] = line.charAt(j);
        }
        System.out.println(Integer.toString(solve(board)));
    }
}

}