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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define ff first
- #define ss second
- #define pb push_back
- int main()
- {
- int test;
- cin>>test;
- while(test--){
- int n;
- cin>>n;
- string a="";
- string b="";
- for(int i=1; i<=n; i++){
- a += (i%2) ? "##" : "..";
- b += (i%2) ? ".." : "##";
- }
- for(int i=1; i<=n; i++){
- if(i%2)
- cout<<a<<"\n"<<a<<"\n";
- else
- cout<<b<<"\n"<<b<<"\n";
- }
- }
- }
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