/**
* author: wxhtzdy
* created: 03.07.2022 11:16:52
**/
#include <bits/stdc++.h>
using namespace std;
class dsu {
public:
vector<int> p;
int n;
dsu(int _n) : n(_n) {
p.resize(n);
iota(p.begin(), p.end(), 0);
}
inline int get(int x) {
return (x == p[x] ? x : (p[x] = get(p[x])));
}
inline bool unite(int x, int y) {
x = get(x);
y = get(y);
if (x != y) {
p[x] = y;
return true;
}
return false;
}
};
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, m, q;
cin >> n >> m >> q;
dsu d(n);
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
int x;
cin >> x;
--x;
d.unite(j, x);
}
}
while (q--) {
int a, b;
cin >> a >> b;
--a; --b;
cout << (d.get(a) == d.get(b) ? "DA" : "NE") << '\n';
}
return 0;
}
