1 2
0 1 2
0 1
1 2

2 4
0 1 2
3 4 5
0 3
0 4
1 3
1 4

yes
no

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <stack>
#include <set>
#include <map>
#define LL long long 
using namespace std;
const int MAXN = 20010;
vector<int>G[MAXN];
int pre[MAXN], lowlink[MAXN], sccno[MAXN], dfs_clock, scc_cnt;
stack<int> s;
void dfs(int u)
{
	pre[u] = lowlink[u] = ++dfs_clock;
	s.push(u); int sz = G[u].size();
	for(int i=0;i<sz;i++)
	{
		int v = G[u][i];
		if(!pre[v])
		{
			dfs(v);
			lowlink[u] = min(lowlink[u], lowlink[v]);
		}
		else if(!sccno[v])
		{
			lowlink[u] = min(lowlink[u], pre[v]);
		}
	}
	if(lowlink[u] == pre[u])
	{
		scc_cnt++;
		for(;;)
		{
			int x = s.top(); s.pop();
			sccno[x] = scc_cnt;
			if(x == u) break;
		}
	}
}
void find_scc(int n)
{
	dfs_clock = scc_cnt = 0;
	memset(sccno, 0, sizeof(sccno));
	memset(pre, 0, sizeof(pre));
	for(int i=1;i<=n;i++) if(!pre[i])
		dfs(i);
}
int N, M, T;
int main()
{
	while(scanf("%d%d", &T, &M)!=EOF)
	{
		int x, y, z;
		N = 3 * T;
		for(int i=0;i<=2*N;i++) G[i].clear();
		for(int i=1;i<=T;i++)
		{
			scanf("%d%d%d", &x, &y, &z);
			x++; y++; z++;
			G[x+N].push_back(y);
			G[x+N].push_back(z);
			G[y+N].push_back(x);
			G[z+N].push_back(x);
		}
		for(int i=1;i<=M;i++)
		{
			scanf("%d%d", &x, &y);
			x++; y++;
			G[x].push_back(y + N);
			G[y].push_back(x + N);
		}
		find_scc(2 * N);
		int flag = 1;
		for(int i=1;i<=N;i++)
		{
			if(sccno[i] == sccno[i + N])
			{
				flag = 0;
				break;
			}
		}
		if(flag) puts("yes");
		else puts("no");
	}
	return 0;
}