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 JAVA):

Solution:
import java.util.*;
import java.io.*;
import static java.lang.Math.*;

public class MyClass {
    
    static class Pos{
        int x, y;
        
        public Pos(int x, int y){
            this.x = x;
            this.y = y;
        }
        
        public int hashCode(){
            return Objects.hash(x,y);
        }
        
        public boolean equals(Pos p){
            return this.x == p.x && this.y == p.y;
        }
    }
    
    static boolean checkNeighbourGood(int x, int y, int n, int m, char[][] maze){
        int[] dx = {1, 0, -1, 0};
        int[] dy = {0, 1, 0, -1};
        boolean ans = false;
        for(int i = 0; i < 4; i++){
            int newx = x+dx[i];
            int newy = y+dy[i];
            if(newx >= 0 && newx < n && newy >= 0 && newy < m){
                if(maze[newx][newy] == 'G'){
                    ans = true;
                    break;
                }else{
                    maze[newx][newy] = (maze[newx][newy] != 'B') ? '#' : 'B';
                }
            }
        }
        
        return ans;
    }
    
    
    static boolean ifPath(Pos start, int n, int m, char[][] maze){
        boolean[][] visited = new boolean[n][m];
        LinkedList<Pos> Q = new LinkedList<>();
        Q.add(start);
        visited[start.x][start.y] = true;
        boolean found = true;
        while(!Q.isEmpty()){
            Pos top = Q.pollFirst();
            int[] dx = {1, 0, -1, 0};
            int[] dy = {0, 1, 0, -1};    
            for(int i = 0; i < 4; i++){
                int newx = top.x + dx[i];
                int newy = top.y + dy[i];
                if(newx>=0 && newx < n && newy >=0 && newy< m &&!visited[newx][newy] && maze[newx][newy] != '#'){
                    Q.add(new Pos(newx, newy));
                    visited[newx][newy] = true;
                }
            }
        }
        
        for(int i = 0; i < n; i++){
            for(int j = 0; j < m; j++){
                if((maze[i][j] == 'G' && !visited[i][j]) || (maze[i][j] == 'B' && visited[i][j])){
                    return false;
                }
            }
        }
        
        return found;
    }
    
    
    public static void main(String args[]) throws IOException {
        //Scanner sc = new Scanner(System.in);
        //Reader sc = new Reader();
        InputReader sc = new InputReader(System.in);
        PrintWriter pw = new PrintWriter(System.out);
            int T = sc.nextInt();
            while(T-- > 0){
                int n = sc.nextInt();
                int m =sc.nextInt();
                char[][] maze = new char[n][];
                for(int i = 0 ; i < n ; i++){
                    String s = sc.readString();
                    maze[i] = s.toCharArray();
                }
                int good = 0;
                String ans = "";
                for(int i = 0 ; i < n; i++){
                    for(int j = 0 ; j < m ; j++){
                        if(maze[i][j] == 'B'){
                            if(checkNeighbourGood(i, j, n, m, maze)){
                                ans = "No";
                                break;
                            }
                        }else if(maze[i][j] == 'G'){
                           good++;
                        }
                    }
                    if(ans.equals("No")){
                        break;
                    }
                }
                if(ans.equals("No")){
                    pw.println(ans);
                }else{
                    if((good == 0)  || ((maze[n-1][m-1] == '.' || maze[n-1][m-1] == 'G') && ifPath(new Pos(n-1,m-1),n, m,maze))){
                        ans = "Yes";
                    }else{
                        ans = "No";
                    }
                    pw.println(ans);
                }
            }
            
            pw.close();
          
    }
    
    static class InputReader
    {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;
 
        public InputReader(InputStream stream)
        {
            this.stream = stream;
        }
 
        public int read()
        {
            if (numChars==-1)
                throw new InputMismatchException();
 
            if (curChar >= numChars)
            {
                curChar = 0;
                try
                {
                    numChars = stream.read(buf);
                }
                catch (IOException e)
                {
                    throw new InputMismatchException();
                }
 
                if(numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }
 
        public String nextLine()
        {
            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
            String stock = "";
            try
            {
                stock = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return stock;
        }
        public int nextInt()
        {
            int c = read();
 
            while(isSpaceChar(c))
                c = read();
 
            int sgn = 1;
 
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
 
            int res = 0;
            do
            {
                if(c<'0'||c>'9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
 
            return res * sgn;
        }
 
        public long nextLong()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            long res = 0;
 
            do
            {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
            return res * sgn;
        }
 
        public double nextDouble()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.')
            {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.')
            {
                c = read();
                double m = 1;
                while (!isSpaceChar(c))
                {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }
 
        public String readString()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do
            {
                res.appendCodePoint(c);
                c = read();
            }
            while (!isSpaceChar(c));
 
            return res.toString();
        }
 
        public boolean isSpaceChar(int c)
        {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
 
        public String next()
        {
            return readString();
        }
 
        public interface SpaceCharFilter
        {
            public boolean isSpaceChar(int ch);
        }
    }
 
    
    
    static class Reader 
    { 
        final private int BUFFER_SIZE = 1 << 20; 
        private DataInputStream din; 
        private byte[] buffer; 
        private int bufferPointer, bytesRead; 
  
        public Reader() 
        { 
            din = new DataInputStream(System.in); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public Reader(String file_name) throws IOException 
        { 
            din = new DataInputStream(new FileInputStream(file_name)); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public String nextLine() throws IOException 
        { 
            byte[] buf = new byte[64]; // line length 
            int cnt = 0, c; 
            while ((c = read()) != -1) 
            { 
                if (c == '\n') 
                    break; 
                buf[cnt++] = (byte) c; 
            } 
            return new String(buf, 0, cnt); 
        } 
  
        public int nextInt() throws IOException 
        { 
            int ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do
            { 
                ret = ret * 10 + c - '0'; 
            }  while ((c = read()) >= '0' && c <= '9'); 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public long nextLong() throws IOException 
        { 
            long ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public double nextDouble() throws IOException 
        { 
            double ret = 0, div = 1; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
  
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
  
            if (c == '.') 
            { 
                while ((c = read()) >= '0' && c <= '9') 
                { 
                    ret += (c - '0') / (div *= 10); 
                } 
            } 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        private void fillBuffer() throws IOException 
        { 
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE); 
            if (bytesRead == -1) 
                buffer[0] = -1; 
        } 
  
        private byte read() throws IOException 
        { 
            if (bufferPointer == bytesRead) 
                fillBuffer(); 
            return buffer[bufferPointer++]; 
        } 
  
        public void close() throws IOException 
        { 
            if (din == null) 
                return; 
            din.close(); 
        } 
    } 
    
    
    
}