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#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;
                }
            }

        }
        if(b)
        {
            cout<<"YES"<<endl;
        }
        else
        {
            cout<<"NO"<<endl;
        }
    }
    return 0;
}