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

public class Main {
    
    public static Scanner sc = new Scanner(System.in);
    public static PrintWriter pw = new PrintWriter(System.out);
    
    public static void main(String[] args) {
        
        int t = 1;
        while( t > 0 ) {
            solve();
            t--;
        }
        
        pw.flush();
        
    }
    
    static void solve() {
        
        int N = sc.nextInt();
        int M = sc.nextInt();
        int S = sc.nextInt()-1;
        int G = sc.nextInt()-1;
        boolean[] visited = new boolean[N];
        ArrayList<ArrayList<Integer>> edge = new ArrayList<>();
        LinkedList<Integer> que = new LinkedList<>();
        
        for( int i = 0; i < N; i++ ) {
            edge.add(new ArrayList<>());
        }
        
        for( int i = 0; i < M; i++ ) {
            int f = sc.nextInt()-1;
            int t = sc.nextInt()-1;
            edge.get(f).add(t);
            edge.get(t).add(f);
        }
        
        int U = sc.nextInt();
        for( int i = 0; i < U; i++ ) {
            int x = sc.nextInt()-1;
            visited[x] = true;
        }
        
        que.offer(S);
        while( !que.isEmpty() ) {
            int now = que.poll();
            if( visited[now] ) continue;
            visited[now] = true;
            for( int next : edge.get(now) ) {
                if( !visited[next] ) que.offer(next);
            }
        }
        
        pw.println( visited[G] ? "Yes" : "No" );
        
    }
    
}