P1800A

#include <bits/stdc++.h>
using namespace std;
#define ll long long
void solve(){
    ll n;
    cin>>n;
    string s;
    cin>>s;
    transform(s.begin(),s.end(),s.begin(),::tolower);
    ll i=0;
    while (i<s.length()-1){
        if (!(s[i]=='m' || s[i]=='e' || s[i]=='o' || s[i]=='w')){
            cout<<"NO\n";
            return;
        }
        if ((s[i]!=s[i+1]) && ((s[i]=='m' && s[i+1]!='e') || (s[i]=='e' && s[i+1]!='o') || (s[i]=='o' && s[i+1]!='w') || s[i]=='w')){
            cout<<"NO\n";
            return;
        }
        i++;
    }
    set <char> S;
    for (ll i=0; i<s.length(); i++){
        S.insert(s[i]);
    }
    if (S.size()==4) cout<<"YES\n";
    else cout<<"NO\n";

}
int main()
{
    int t;
    cin>>t;
    while(t--){
        solve();
    }
}