#include <bits/stdc++.h>
using namespace std;
const int nx=6e3+5;
int n, m, k, sz, pa[nx], dist[nx], w, res[nx];
vector<pair<int, int>> d[nx];
void dfs(int u)
{
//cout<<"dist "<<u<<' '<<dist[u]<<'\n';
for (auto [v, w]:d[u]) dist[v]=dist[u]+w, dfs(v);
}
int main()
{
cin.tie(NULL)->sync_with_stdio(false);
cin>>n>>m>>k>>sz;
for (int i=1; i<=n; i++) cin>>pa[i]>>w, d[pa[i]].push_back({i, w+1});
for (int i=n+1; i<=n+m; i++) cin>>pa[i]>>w, d[pa[i]].push_back({i, w+1});
dfs(0);
for (int i=n+1; i<=n+m; i++)
{
if (dist[i]==k) res[i]=1;
set<int> s;
s.insert(0);
int tmp=i;
while (tmp!=0) s.insert(dist[i]-dist[pa[tmp]]), tmp=pa[tmp];
for (int j=0; j<=n; j++) if (s.find(k-dist[j]-sz-1)!=s.end()) res[i]=1;
if (res[i]) cout<<"YES\n";
else cout<<"NO\n";
}
}
