1 #include<iostream>
 2 #include<map>
 3 #include<vector> 
 4 using namespace std;
 5 map<string, vector<string>> m1; 
 6 map<string, int> m2;
 7 vector<string> v1;
 8 int main()
 9 {
10     int n, m;
11     cin >> n >> m;
12     for(int i = 0; i < n; i++) {
 
13         string a, b;
14         cin >> a >> b;
15         m1[a].push_back(b);
16         m1[b].push_back(a); 
17     }
18     while(m--) {
19         int k;
20         cin >> k;
21         v1.clear();
22         m2.clear();
23         int flag = 0;
24         while(k--) {
25             string
 
 a;
26             cin >> a;
27             m2[a] = 1;
28             v1.push_back(a);
29         }
30         for(int i = 0; i < v1.size(); i++) {
31             for(int j = 0; j < m1[v1[i]].size(); j++) {
32                 if(m2[m1[v1[i]][j]] == 1) {
33                     flag = 1;
34                     break
 
;
35                 }
36             }
37         }
38         if(flag == 1) {
39             cout << "No" << endl;
40         } else {
41             cout << "Yes" << endl;
42         }
43     }
44  }