#include<iostream>
using namespace std;
int main()
{ int test_case,l,c,L,C,h,w;
cin>>test_case;
while(test_case!=0)
{
    cin>>l>>c>>h>>w;
    L=(l+1)+(l*h);
    C=(c+1)+(c*w);
    for(int i=0;i<L;i++)
    {
     for(int j=0;j<C;j++)
     {
       if((i%(h+1)==0)||(j%(w+1)==0))
       cout<<"*";  // was bug
       else
       cout<<".";  // and here
       }
     cout<<"\n";
    }
test_case--;
cout << '\n';  // <--- not necessery
}
}
/*
Your code is very bad formatted or wrong pasted.
*/

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MwozIDEgMiAxCjQgNCAxIDIKMiA1IDIgMg==

3
3 1 2 1
4 4 1 2
2 5 2 2