#include <iostream>
#include<algorithm>
#include<vector>
#include<string>
using namespace std;
int main()
{
int t;
cin >> t;
while (t--)
{
int n, m, q = 0;
bool b = false;
cin >> n >> m;
vector<vector<char>>a(n, vector<char>(m));
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
{
cin >> a[i][j];
}
}
for (int j = 0; j < m; j++)
{
for (int i = 0; i < n; i++)
{
if (a[i][j] == 'v' && q == 0)
{
q++;
break;
}
if ((a[i][j] == 'i') && (q == 1))
{
q++;
break;
}
if ((a[i][j] == 'k') && (q == 2))
{
q++;
break;
}
if ((a[i][j] == 'a') && (q == 3))
{
b = true;
break;
}
}
}
if (b)
{
cout << "YES" << endl;
}
else
{
cout << "NO" << endl;
}
}
return 0;
}