#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001
struct rolling_hash{

	long long t_hash;
	static vector<long long> power;
	static const long long MOD = (1LL<<61)-1;
	static const long long b = 123456;
	int sz;
	
	rolling_hash(){		
		sz = 0;
		t_hash = 0;
	}
	
	rolling_hash(long long c){
		sz = 1;
		t_hash = b*c;
	}

	long long mul(__int128 x,__int128 y){
		__int128 t = x*y;
		t = (t>>61) + (t&MOD);
		
		if(t>=MOD)t -= MOD;
		return t;
	}
	
	long long get_pow(int sz){
		if(power.size()>sz)return power[sz];
		
		while(power.size()<=sz){
			if(power.size()==0)power.push_back(1);
			else power.push_back(mul(power.back(),b));
		}
		return power.back();
		
	}
	
	rolling_hash &operator+=(const rolling_hash &another){
		
		(*this).t_hash = mul((*this).t_hash,get_pow(another.sz));
		(*this).t_hash += another.t_hash;
		if((*this).t_hash>=MOD)(*this).t_hash -= MOD;
			
		(*this).sz += another.sz;
		
		return (*this);
	}
	
	rolling_hash operator+(const rolling_hash &another)const{
		return (rolling_hash(*this)+=another);
	}
	
	rolling_hash &operator-=(const rolling_hash &another){

		(*this).t_hash += MOD - mul(another.t_hash,get_pow((*this).sz-another.sz));
		if((*this).t_hash>=MOD)(*this).t_hash -= MOD;
			
		(*this).sz -= another.sz;

		return (*this);
	}
	
	rolling_hash operator-(const rolling_hash &another)const{
		return (rolling_hash(*this)-=another);
	}
	
	bool operator<(const rolling_hash &another)const{
		if((*this).t_hash!=another.t_hash)return (*this).t_hash<another.t_hash;
		return (*this).sz<another.sz;
	}
	
	bool operator==(const rolling_hash &another)const{
		return ((*this).t_hash==another.t_hash && (*this).sz==another.sz);
	}

	
};

vector<long long> rolling_hash::power;

int main(){
	
	int N;
	cin>>N;
	
	vector<map<int,int>> mp(N);
	map<int,int> LCA;
	vector<long long> v(N,1);
	rep(i,N){
		int m;
		cin>>m;
		
		rep(j,m){
			int p,e;
			cin>>p>>e;
			mp[i][p] = e;
			LCA[p] = max(LCA[p],e);
			rep(k,e)v[i] *= p;
		}
	}
	
	map<int,int> pos;
	int cur = 0;
	vector<int> ps(LCA.size());
	for(auto a:LCA){
		pos[a.first] = cur;
		ps[cur] = a.first;
		cur++;
	}

	
	set<rolling_hash> S;
	vector<vector<int>> tt(N);
	rep(i,N){
		vector<int> t;
		for(auto a:mp[i]){
			if(a.second == LCA[a.first]){
				t.push_back(pos[a.first]);
			}
		}
		sort(t.begin(),t.end());
		rolling_hash h;
		rep(j,t.size())h += rolling_hash(t[j]);
		tt[i] = t;
		if(S.count(h))continue;

		rep(j,1<<t.size()){
			rolling_hash th;
			rep(k,t.size()){
				if((j>>k)&1)th += rolling_hash(t[k]);
			}
			S.insert(th);
		}
	}
	//cout<<'a'<<endl;
	
	vector<vector<int>> t(cur);
	
	rep(i,cur)t[i] = {i};
	
	while(true){
		if(t.size()==0){
			cout<<-1<<endl;
			return 0;
		}
		vector<vector<int>> nt;
		rep(i,t.size()){
			
			int last = t[i].back();
			for(int j=last+1;j<cur;j++){
				vector<int> temp = t[i];
				temp.push_back(j);
				rolling_hash h;
				rep(k,temp.size())h += rolling_hash(temp[k]);
				if(!S.count(h)){
					cout<<temp.size()<<endl;
					
					vector<vector<int>> ans(temp.size());
					rep(i,N){
						rep(j,temp.size()){
							if(binary_search(tt[i].begin(),tt[i].end(),temp[j]))continue;
							ans[j].push_back(v[i]);
							break;
						}
					}
					
					rep(i,temp.size()){
						cout<<ans[i].size();
						rep(j,ans[i].size()){
							cout<<' ';
							cout<<ans[i][j];
						}
						cout<<endl;
					}
					
					
					return 0;
				}
				nt.push_back(temp);
				
			}
		}
		swap(t,nt);
		
	}
	
	return 0;
}