#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
int l, c, s;
scanf("%d %d %d", &l, &c, &s);
const int breadth = (c * (s + 1)) + 1;
const int height = (l * (s + 1)) + 1;
for(int i = 0; i < height; i++)
{
for(int j = 0; j < breadth; j++)
{
if(i % (s+1) == 0 || j % (s+1) == 0)
{
printf("*");
}
else if((i/(s+1) + j/(s+1)) % 2 == 0)
{
if(i % (s+1) == j % (s+1))
{
printf("\\");
}
else
{
printf(".");
}
}
else
{
if(i % (s+1) == (s+1) - (j % (s+1)))
{
printf("/");
}
else
{
printf(".");
}
}
}
printf("\n");
}
printf("\n");
}
}
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