#include <algorithm>
#include <complex>
#include <cstdlib>
#include <ctime>
#include <time.h>
#include <iomanip>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <numeric>
#include <limits>
#include <type_traits>

using namespace std;
#define SAY_YES cout << "YES" << endl;
#define SAY_Yes cout << "Yes" << endl;
#define SAY_NO cout << "NO" << endl;
#define SAY_No cout << "No" << endl;
#define IFYES(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "YES" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "NO" << endl;  \
    }
#define IFYes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "Yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "No" << endl;  \
    }
#define IFyes(TRUE_OR_FALSE)   \
    if (TRUE_OR_FALSE)         \
    {                          \
        cout << "yes" << endl; \
    }                          \
    else                       \
    {                          \
        cout << "no" << endl;  \
    }
#define DEBUG_OUTPUT_ARRAY(XXX, ONE)                            \
    for (int i = 0; i < (ONE); i++)                             \
    {                                                           \
        cout << "DEBUG: i = " << i << " -> " << XXX[i] << endl; \
    }
#define DEBUG_OUTPUT_ARRAY2(XXX, ONE, TWO)                             \
    for (int i = 0; i < (ONE); i++)                                    \
    {                                                                  \
        cout << "<<< i = " << i << " >>>" << endl;                     \
        for (int j = 0; j < (TWO); j++)                                \
        {                                                              \
            cout << "DEBUG: j = " << j << " -> " << XXX[i][j] << endl; \
        }                                                              \
    }
#define DEBUG_OUTPUT_ARRAY2_BOX(XXX, ONE, TWO) \
    for (int i = 0; i < (ONE); i++)            \
    {                                          \
        cout << i << "  ";                     \
        for (int j = 0; j < (TWO); j++)        \
        {                                      \
            cout << XXX[i][j] << " ";          \
        }                                      \
        cout << endl;                          \
    }

typedef pair<long long int, long long int> pll;


const long long int mod = 1000000007;
const long long int INF = 1e18;

long long int N,M,K,H,W,res=0,A[300000]={},zero=0;
//今見ている番号＋今どの段階か(なにも飛ばしていない、１つ飛ばした、２つ飛ばした)＋奇数かどうか
long long int memo[1000400]={};
vector<long long int>positive,negative;

string S[100],T;


int main()
{
    cout << fixed << setprecision(18);
    cin>>H>>W;
    for(long long int i = 0; i < H; i++){
        cin>>S[i];
    }
    for(long long int i = 0; i < H; i++){
        for(long long int j = 0; j < W; j++){
            long long int x[5]={0,1,0,-1},y[5]={1,0,-1,0};
            if(S[i][j]=='#'){
                bool ok=false;
                for(long long int k = 0; k < 4; k++){
                    if(i+x[k]<0||i+x[k]>=H||j+y[k]<0||j+y[k]>=W){
                        continue;
                    }
                    if(S[i+x[k]][j+y[k]]=='#'){
                        ok=true;
                    }
                }
                if(!ok){
                    cout<<"No"<<endl;
                    return 0;
                }
            }
        }
    }
    cout<<"Yes"<<endl;
}


Measured memory_bytes: 256