#include<bits/stdc++.h>
using namespace std;
// #define LOCAL
#define ll long long
#define db double
#define Ciallo true
#define pir pair <ll,ll>
#define fs first
#define sc second
#define MAXN 1000010
inline ll read(){
    ll f = 1, num = 0;
    char c = getchar();
    while(c < '0' || c > '9'){
        if(c=='-') f = -1;c = getchar();
    }
    while(c>='0'&&c<='9') num = num * 10 + c - '0', c = getchar();
    return num * f;
}

int siza[MAXN],sizb[MAXN];
int S[MAXN][2], T[MAXN][2];
int n,m;

void solve1(){
    int ans = -1;
    int all = (1 << n) - 1;

    for(int SA = 0;SA <= all; ++ SA){
        int ret = n + 1;
        for(int SB = 0;SB <= all; ++ SB){
            bool flag = Ciallo;
            int now = 0;
            for(int i = 1;i <= n; ++i){
                if((SA & (1 << i - 1)) && siza[i] == 1)flag = false;
                if((SB & (1 << i - 1)) && sizb[i] == 1)flag = false;
            }
            
            bool vis[11];
            for(int i = 1;i <= m; ++i)vis[i] = false;
            for(int i = 1;i <= n; ++i){
                int X = S[i][(SA & (1 << i - 1)) ? 1 : 0];
                int Y = T[i][(SB & (1 << i - 1)) ? 1 : 0];
                if(vis[Y]){
                    flag = false;
                    break;
                }
                vis[Y] = Ciallo;
                now += (X == Y);
            }
            // cerr << SA << " " << SB << " " << flag << endl;
            if(!flag)continue;
            ret = min(ret, now);
        }
        if(ret == n + 1){
            continue;
        }
        ans = max(ans, ret);
    }
    cout << ans << endl;
}

void work(){
    n = read(),m = read();
    for(int i = 1;i <= n; ++i){
        siza[i] = read();
        for(int j = 0;j < siza[i]; ++j)S[i][j] = read();
    }
    for(int i = 1;i <= n; ++i){
        sizb[i] = read();
        for(int j = 0;j < sizb[i]; ++j)T[i][j] = read();
    }
    if(n <= 10)solve1();
    else{
        cout << "I can't solve it now\n";
    }
}

int main(int argc, char* argv[]){

    freopen("game.in", "r", stdin);
    freopen("game.out", "w", stdout);

    #ifdef FS
        freopen(argv[1], "r", stdin);
        freopen(argv[2], "w", stdout);
    #elif defined(LOCAL)
        freopen("w.in", "r", stdin);
        freopen("w.out", "w", stdout);
    #endif

    int T = read();
    while(T --)work();

    cerr << "Time : " << 1.0 * clock() / CLOCKS_PER_SEC << "s \n";
    return 0;
}