Problem: Vivek has encountered a problem. He has a maze that can be represented as an n × m grid. Each of the grid cells may represent the following:

  * Empty — '.' 
  * Wall — '#' 
  * Good person — 'G' 
  * Bad person — 'B' 



The only escape from the maze is at cell (n, m).

A person can move to a cell only if it shares a side with their current cell and does not contain a wall. Vivek wants to block some of the empty cells by replacing them with walls in such a way, that all the good people are able to escape, while none of the bad people are able to. A cell that initially contains 'G' or 'B' cannot be blocked and can be travelled through.

Help him determine if there exists a way to replace some (zero or more) empty cells with walls to satisfy the above conditions.

It is guaranteed that the cell (n,m) is empty. Vivek can also block this cell.

Input

The first line contains one integer t (1 ≤ t ≤ 100) — the number of test cases. The description of the test cases follows.

The first line of each test case contains two integers n, m (1 ≤ n, m ≤ 50) — the number of rows and columns in the maze.

Each of the next n lines contain m characters. They describe the layout of the maze. If a character on a line equals '.', the corresponding cell is empty. If it equals '#', the cell has a wall. 'G' corresponds to a good person and 'B' corresponds to a bad person.

Output

For each test case, print "Yes" if there exists a way to replace some empty cells with walls to satisfy the given conditions. Otherwise print "No"

You may print every letter in any case (upper or lower).

Example

Input


6
1 1
.
1 2
G.
2 2
#B
G.
2 3
G.#
B#.
3 3
#B.
#..
GG.
2 2
#B
B.


Output


Yes
Yes
No
No
Yes
Yes

Note

For the first and second test cases, all conditions are already satisfied.

For the third test case, there is only one empty cell (2,2), and if it is replaced with a wall then the good person at (1,2) will not be able to escape.

For the fourth test case, the good person at (1,1) cannot escape.

For the fifth test case, Vivek can block the cells (2,3) and (2,2).

For the last test case, Vivek can block the destination cell (2, 2).

Solution (in PYTHON3):

Solution:
def check_bad_guy(row_index, col_index, board):
    if row_index > 0:
        if board[row_index - 1][col_index] == 'B':
            return True
    if row_index < len(board) - 1:
        if board[row_index + 1][col_index] == 'B':
            return True
    if col_index > 0:
        if board[row_index][col_index - 1] == 'B':
            return True
    if col_index < len(board[0]) -1:
        if board[row_index][col_index + 1] == 'B':
            return True
    return False


def check_color(row_index, col_index, board_color):
    neighbouring_colors = list()
    if row_index > 0:
        if board_color[row_index - 1][col_index] != 0:
            neighbouring_colors.append(board_color[row_index - 1][col_index])
    if col_index > 0:
        if board_color[row_index][col_index - 1] != 0:
            neighbouring_colors.append(board_color[row_index][col_index - 1])
    return neighbouring_colors


def solve(board):
    n = len(board)
    m = len(board[0])
    if board[n - 1][m - 1] == 'B':
        return False
    color_connections = dict()
    available_color = 1
    board_color = [[0] * m for i in range(n)]
    """ print('starting board color')
    print(board_color) """
    good_guys = set()
    for row_index in range(n):
        for col_index in range(m):
            """ print('\n')
            print(f'row index {row_index}, col index {col_index}, symbol {board[row_index][col_index]}') """
            if board[row_index][col_index] == '.':
                if check_bad_guy(row_index, col_index, board):
                    board[row_index][col_index] == '#'
                else:
                    neighbouring_colors = check_color(row_index, col_index, board_color)
                    """ print(f'neighbouring color {neighbouring_colors}') """
                    if len(neighbouring_colors) == 0:
                        board_color[row_index][col_index] = available_color
                        color_connections[available_color] = set()
                        available_color += 1
                    elif len(neighbouring_colors) == 1:
                        board_color[row_index][col_index] = neighbouring_colors[0]
                    elif len(neighbouring_colors) == 2:
                        """ print(neighbouring_colors) """
                        board_color[row_index][col_index] = neighbouring_colors[0]
                        color_connections[neighbouring_colors[0]].add(neighbouring_colors[1])
                        color_connections[neighbouring_colors[1]].add(neighbouring_colors[0])
            elif board[row_index][col_index] == 'G':
                good_guys.add((row_index, col_index))
                if check_bad_guy(row_index, col_index, board):
                    return False
                else:
                    neighbouring_colors = check_color(row_index, col_index, board_color)
                    """ print(f'neighbouring color {neighbouring_colors}') """
                    if len(neighbouring_colors) == 0:
                        board_color[row_index][col_index] = available_color
                        color_connections[available_color] = set()
                        available_color += 1
                    elif len(neighbouring_colors) == 1:
                        board_color[row_index][col_index] = neighbouring_colors[0]
                    elif len(neighbouring_colors) == 2:
                        board_color[row_index][col_index] = neighbouring_colors[0]
                        color_connections[neighbouring_colors[0]].add(neighbouring_colors[1])
                        color_connections[neighbouring_colors[1]].add(neighbouring_colors[0])
    """ print('ending board color')
    print(board_color) """
    return evaluate_color(board_color, good_guys, color_connections)
     

def evaluate_color(board_color, good_guys, color_connections):
    """ print(board_color) """
    n = len(board_color)
    m = len(board_color[0])
    end_color = board_color[n - 1][m - 1]
    if len(good_guys) == 0:
        return True
    elif end_color == 0:
        return False
    end_connections = set()
    checked = dict()
    stack = [end_color]
    checked[end_color] = True
    while len(stack) != 0:
        current_color = stack.pop()
        end_connections.add(current_color)
        """ print(color_connections) """
        for color in color_connections[current_color]:
            if color not in checked:
                stack.append(color)
                checked[color] = True
    for (row_index, col_index) in good_guys:
        if board_color[row_index][col_index] not in end_connections:
            return False
    return True

                        


t = int(input())
for testcase in range(t):
    """ print(f'starting testcase {testcase}') """
    n, m = list(map(int, input().split()))
    board = [0] * n
    for row_index in range(n):
        board[row_index] = list(input())
    """ print('problem statement')
    print(board) """
    if solve(board):
        print('Yes')
    else:
        print('No')
    """ print(f'ending testcase {testcase}')
    print('\n') """