#include <bits/stdc++.h>
using namespace std;
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
int s;
cin >> s;
assert(s==2);
int n;
cin >> n;
int grid[n][n];
for(int i = 0;i<n;i++){
for(int j = 0;j<n;j++){
cin >> grid[i][j];
}
}
int ans[n];
int cur = 1;
cout << cur << " ";
ans[0]=1;
for(int i = 1;i<n;i++){
if(grid[0][i-1]!=grid[0][i]){
cur++;
cout << cur << " ";
ans[i]=cur;
}
else{
set<int>vals;
for(int j = i-1;j>=0;j--){
if(grid[i][j]==grid[i][j+1]&&vals.find(ans[j])==vals.end()){
ans[i]=ans[j];
cout << ans[i] << " ";
break;
}
vals.insert(ans[j]);
}
}
}
cout << "\n";
for(int i = 1;i<=n;i++){
cout << i << " " << i+1 << "\n";
}
return 0;
}
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