from collections import defaultdict, deque


def main():
    n, m = map(int, input().split())
    s, g = map(int, input().split())
    edge = defaultdict(list)
    for _ in range(m):
        fr, to = map(int, input().split())
        edge[fr].append(to)
        edge[to].append(fr)

    _ = int(input())
    island = list(map(int, input().split()))
    for i in island:
        edge[i].clear()

    visited = [False] * (n + 1)
    visited[s] = True
    q = deque()
    q.append(s)
    while q:
        cur = q.popleft()
        for x in edge[cur]:
            if not visited[x]:
                visited[x] = True
                q.append(x)

    if visited[g]:
        print('Yes')
    else:
        print('No')


if __name__ == "__main__":
    main()