/*#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")
*/
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 1e3 + 7;
int n, m, q, p[N], r[N];
int getp (int x) {
if (x == p[x]) return x;
return p[x] = getp(p[x]);
}
void unite (int a, int b) {
a = getp(a);
b = getp(b);
if (a == b) return;
if (r[b] > r[a]) swap(a, b);
p[b] = a;
r[a] += r[b];
}
signed main () {
// freopen("", "r", stdin);
// freopen("", "w", stdout);
ios_base::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
cin >> n >> m >> q;
for (int i = 1; i <= n; i++) {
p[i] = i;
r[i] = 1;
}
for (int i = 1; i <= m; i++) {
for (int j = 1; j <= n; j++) {
int x;
cin >> x;
unite(x, j);
}
}
while (q--) {
int a, b;
cin >> a >> b;
if (getp(a) == getp(b)) cout << "DA\n";
else cout << "NE\n";
}
}
