iiitv/ChefLib

// Code by Piyush

#include <bits/stdc++.h>
#define endl "\n"
using namespace std;
int main() {

    std::ios::sync_with_stdio(false);
    int testCases;
    cin >> testCases;
    while(testCases--) {
        int minutes;
        cin >> minutes;
        string arr[minutes];
        for (int i = 0; i < minutes; i++)
            cin >> arr[i];
        bool instructions = true;
        for (int i = 0; i < minutes; i++) {
            if (arr[i] == "cookie" && arr[i + 1] != "milk") {
                instructions = false;
                break;
            }
        }
        if (instructions)
          cout << "YES" << endl;
        else
          cout << "NO" << endl;
    }
    return 0;
}