#include <cstring>

 #include <cstdio>

 inline void read(int &x)

 {

     x=; register char ch=getchar();

     for(; ch>''||ch<''; ) ch=getchar();

     for(; ch>=''&&ch<=''; ch=getchar()) x=x*+ch-'';

 }

 const int M();

 const int N();

 int n,p,sumvis;

 bool link[N][M];

 int vis[M],mat[M];

 bool find(int u)

 {

     for(int v=; v<=n; ++v)

         if(vis[v]!=sumvis&&link[u][v])

         {

             vis[v]=sumvis;

             if(!mat[v]||find(mat[v]))

             {

                 mat[v]=u;

                 return ;

             }

         }

     return false;

 }

 inline bool work()

 {

     int m,cnt=;

     read(p),read(n);

     for(int u=; u<=p; ++u)

     {

         read(m);

         for(int v; m--; )

           read(v),link[u][v]=;

     }

     for(int i=; i<=p; ++i)

     {

         sumvis++;

         cnt+=find(i);

     }

     return cnt==p;

 }

 inline void init()

 {

     sumvis=;

     memset(mat,,sizeof(mat));

     memset(vis,,sizeof(vis));

     memset(link,,sizeof(link));

 }

 int Presist()

 {

     int t; read(t);

     for(; t--; init())

       if(!work()) puts("NO");

       else puts("YES");

     return ;

 }

 int Aptal=Presist();

 int main(int argc,char**argv){;}