#include<cstdio>

#include<iostream>

#include<cstring>

#include<vector>

#define ll long long

#define R register ll

char B[<<],*S=B,*T=B;

#define getchar() (S==T&&(T=(S=B)+fread(B,1,1<<15,stdin),S==T)?EOF:*S++)

const int M=;

using namespace std;

inline int g() {

    R ret=,fix=; register char ch; while(!isdigit(ch=getchar())) fix=ch=='-'?-:fix;

    do ret=ret*+(ch^); while(isdigit(ch=getchar())); return ret*fix;

}

int n,ans=,C; ll a[][]; vector<pair<int,int> > q[];

#define pb push_back

inline int Gauss() { ll ans=;

    for(R i=;i<n;++i) {

        for(R j=i+;j<n;++j) while(a[j][i]) {

            ll t=a[i][i]/a[j][i];

            for(R k=i;k<n;++k) (a[i][k]-=t*a[j][k])%=M;

            swap(a[i],a[j]); ans=-ans;

        } ans=(ans*a[i][i])%M; if(!ans) return ;

    } return (ans+M)%M;

}

inline ll Inv(int x) {

    if(x==) return ; if(x<) return ;

    return (M-M/x*Inv(M%x))%M;

}

inline int Gauss2() { register ll ans=;

    for(R i=;i<n;++i) for(R j=i+;j<n;++j) {

        if(!a[i][i]) return ; if(!a[j][i]) continue;

        register ll t=(ll)a[j][i]*Inv(a[i][i]%M)%M;

        for(R k=i;k<n;++k) a[j][k]=((a[j][k]-t*a[i][k])%M+M)%M;

    } for(R i=;i<n;++i) ans=ans*a[i][i]%M; return ans;

}

signed main() {

    n=g(); for(R i=,x;i<n;++i) { x=g();

        for(R j=,u,v;j<=x;++j) u=g(),v=g(),q[i].pb(make_pair(u,v));

    } C=<<(n-);

    for(R i=;i<C;++i) { R cnt=; memset(a,,sizeof(a));

        for(R j=;j<n;++j) if(i&(<<j-)) {

            for(R k=,u,v;k<q[j].size();++k)

                u=q[j][k].first,v=q[j][k].second,

                ++a[u][u],++a[v][v],--a[u][v],--a[v][u];

            ++cnt;

        } if((n-cnt)&) ans=(ans+Gauss2())%M;

        else ans=(ans-Gauss2()+M)%M;

    } printf("%lld\n",ans);

}