// #pragma GCC optimize("O3,unroll-loops,Ofast")
// #pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
using namespace std;
const short N = 1000+2;
struct DSU {
short e[N];
DSU(){for(short i = 1; i < N-1; i++) e[i]=-1;}
short get(short x) { return e[x] < 0 ? x : e[x] = get(e[x]); }
bool sameSet(short a, short b) { return get(a) == get(b); }
short size(short x) { return -e[get(x)]; }
bool unite(short x, short y) { // union by size
x = get(x), y = get(y); if (x == y) return 0;
if (e[x] > e[y]) swap(x,y);
e[x] += e[y]; e[y] = x; return 1;
}
};
DSU t;
short n,m,a,b;
int q;
int32_t main(){
ios_base::sync_with_stdio(0); cin.tie(0);
cin>>n>>m>>q;
for(short i=1;i<=m;i++){
for(short j=1;j<=n;j++){
cin>>a;
t.unite(j,a);
}
}
while(q--){
cin>>a>>b;
if(t.sameSet(a,b)) cout<<"DA\n";
else cout<<"NE\n";
}
}
