// In the name of God, the Most Gracious, the Most Merciful.
// iflbot(); - @yavuzskarahan
#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0); cin.tie(0);
#define FOR(i, L, R) for (int i = (L); i <= (R); i++)
#define pb push_back
int n, m, q, a, b, u, v;
vector<int> adj[1002];
int parent[1002];
inline int find(int a){
if (a==parent[a]) return a;
else return parent[a] = find(parent[a]);
}
inline void unite(int a, int b){
a = find(a);
b = find(b);
parent[b] = a;
return;
}
inline int solve(){
cin >> n >> m >> q;
FOR(i,1,n) parent[i] = i;
FOR(i,1,m){
FOR(j,1,n){
cin >> a;
unite(j,a);
}
}
while(q--){
cin >> a >> b;
if (find(a) == find(b)) cout << "DA" << endl;
else cout << "NE" << endl;
}
return 0;
}
int main() {
fast;
solve();
return 0;
}
