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:
# ------------------- fast io --------------------
import os
import sys
from io import BytesIO, IOBase

BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")


# ------------------- fast io --------------------

def bfs(graph, start=0):
    used = [False] * len(graph)
    used[start] = True
    q = [start]
    for v in q:
        for w in graph[v]:
            if not used[w]:
                used[w] = True
                q.append(w)


def layers(graph, start=0):
    used = [False] * len(graph)
    used[start] = True
    q, ret = [start], []
    while q:
        nq = []
        ret.append(q)
        for v in q:
            for w in graph[v]:
                if not used[w]:
                    used[w] = True
                    nq.append(w)
        q = nq
    return ret


def dfs(graph, start=0):
    n = len(graph)

    dp = [0] * n
    visited, finished = [False] * n, [False] * n

    stack = [start]
    while stack:
        start = stack[-1]

        # push unvisited children into stack
        if not visited[start]:
            visited[start] = True
            for child in graph[start]:
                if not visited[child]:
                    stack.append(child)

        else:
            stack.pop()

            # base case
            dp[start] += 1

            # update with finished children
            for child in graph[start]:
                if finished[child]:
                    dp[start] += dp[child]

            finished[start] = True

    return visited


for _ in range(int(input())):
    n, m = map(int, input().split())
    grid = []
    for __ in range(n):
        s = [k for k in input()]
        grid += [s]

    check = []
    anticheck = []
    for i in range(n):
        for j in range(m):
            if grid[i][j] == 'G':
                check += [i*m + j + 1]
            if grid[i][j] == 'B':
                anticheck += [i*m + j + 1]
                if i != n-1:
                    if grid[i+1][j] == '.':
                        grid[i+1][j] = '#'
                if i != 0:
                    if grid[i-1][j] == '.':
                        grid[i-1][j] = '#'
                if j != 0:
                    if grid[i][j-1] == '.':
                        grid[i][j-1] = '#'
                if j != m - 1:
                    if grid[i][j+1] == '.':
                        grid[i][j+1] = '#'

    graph = [[] for ___ in range(n*m + 1)]

    for i in range(n):
        for j in range(m):
            if grid[i][j] == '#':continue
            current = i * m + j + 1
            if i != 0:
                next_cell = grid[i-1][j]
                if next_cell != '#':
                    graph[current] += [(i-1)*m + (j) + 1]
            if i != n-1:
                next_cell = grid[i+1][j]
                if next_cell != '#':
                    graph[current] += [(i+1)*m + (j) + 1]
            if j != 0:
                next_cell = grid[i][j-1]
                if next_cell != '#':
                    graph[current] += [(i)*m + (j-1) + 1]
            if j != m - 1:
                next_cell = grid[i][j+1]
                if next_cell != '#':
                    graph[current] += [(i)*m + (j+1) + 1]

    vis = dfs(graph, n*m)
    pos = True
    for i in check:
        if not vis[i]:
            pos = False
            break
    for i in anticheck:
        if vis[i]:
            pos = False
            break
    print("Yes" if pos else "No")