#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

void solve(){
    int n;
    cin>>n;
    string s;
    cin>>s;
    vector<bool>done(2*n);
    int i2=0;
    for(int i1=0;i1<2*n;i1++){
        if(done[i1])
            continue;
        done[i1]=true;
        char want=i1<n?'W':'R';
        if(i2>=2*n){
            cout<<"NO\n";
            return;
        }
        while(s[i2]!=want||done[i2]){
            i2++;
            if(i2>=2*n){
                cout<<"NO\n";
                return;
            }
        }
        done[i2]=true;
    }
    cout<<"YES\n";
}

/*

 */

int main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int t=1;cin>>t;
    while(t--) solve();
}