#include<iostream>
using namespace std;
int main(){
int t,i,j;
cin>>t;
while(t--){
int l,c;
cin>>l;
cin>>c;
for(i=0;i<l;i++){
for(j=0;j<c;j++){
if((l==4)&&(c==4)){
if(((i==1)&&(j==1))|| (i==1)&&(j==2) || (i==2)&&(j==1) || (i==2)&&(j==2)){
cout<<".";
}
else cout<<"*";
}
else cout<<"*";
}
cout<<endl;
}
cout<<endl;
}
return 0;
}
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