#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=0;
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 i=0;i<m;i++){
for(int j=0;j<n;j++){
if(a[i][j]=='v'){
q++;
}
if((a[i][j]=='i')&&(q=1)){
q++;
}
if((a[i][j]=='k')&&(q=2)){
q++;
}
if((a[i][j]=='a')&&(q=3)){
b=1;
}
}
q=0;
}
if(b){
cout<<"YES"<<endl;
}
else{
cout<<NO<<endl;
}
}
return 0;
}