#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
#include "../Library/debug.h"
#else
#define dbg(x...)
#endif
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) for (int i = 0; i < (a); ++i)
#define FORd(i, a, b) for (int i = (b) - 1; i >= (a); --i)
#define F0Rd(i, a) for (int i = (a) - 1; i >= 0; --i)
#define trav(a, x) for (auto& a : x)
#define f first
#define s second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) x.begin(), x.end()
const char nl = '\n';
const int INF = 1e9;
const int MOD = 1e9 + 7;
struct DSU {
vector<int> par, sz;
int c;
DSU(int n) : par(n), c(n) {
sz.resize(n, 1);
for (int i = 0; i < n; ++i) par[i] = i;
}
int find(int i) {
return par[i] == i ? i : (par[i] = find(par[i]));
}
bool same(int i, int j) {
return find(i) == find(j);
}
int get_size(int i) {
return sz[find(i)];
}
int count() {
return c;
}
int merge(int i, int j) {
if ((i = find(i)) == (j = find(j))) return -1;
else --c;
if (sz[i] > sz[j]) swap(i, j);
par[i] = j;
sz[j] += sz[i];
return j;
}
};
void solve(){
int n, m,q;
cin>>n>>m>>q;
DSU dsu(n+1);
F0R(i,m){
F0R(j,n){
int a;
cin>>a;
dsu.merge(a,j+1);
}
}
F0R(i,q){
int a,b;
cin>>a>>b;
if(dsu.same(a,b))
cout<<"DA"<<nl;
else cout<<"NE"<<nl;
}
}
int32_t main(){
ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
int TC = 1;
// cin >> TC;
while(TC--){
solve();
}
return 0;
}
