#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin >> t;
while(t--)
{
int n;
cin >> n;
string s;
string a = "Timru";
cin >> s;
sort(s.begin(),s.end());
if(s==a)
{
cout << "YES" << endl;
}
else
{
cout << "NO" << endl;
}
}
return 0;
}
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