#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using i64 = long long;
using u64 = unsigned long long;
using i32 = int;
using u32 = unsigned int;
#define rep(i,n) for(int i=0; i<(n); i++)


int N, M;
int S, G;
vector<vector<int>> E;
vector<int> enabled;


int main() {
    cin >> N >> M;
    cin >> S >> G; S--; G--;
    E.resize(M);
    rep(i,M){
        int u,v; cin >> u >> v; u--; v--;
        E[u].push_back(v);
        E[v].push_back(u);
    }

    enabled.assign(N,1);
    int U; cin >> U;
    rep(i,U){ int a; cin >> a; enabled[a-1] = 0; }
    
    vector<int> reach(N, 0);
    vector<int> I = {0};
    rep(i,I.size()){
        int p = I[i];
        for(int e : E[p]) if(reach[e] == 0) if(enabled[e]){
            reach[e] = 1;
            I.push_back(e);
        }
    }

    if(reach[G] == 0) cout << "No\n"; else cout << "Yes\n";
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;