#include <bits/stdc++.h>

using namespace std;

int main(){
    int t;
    cin>>t;
    while(t--){
        int n;cin>>n;
        string s;cin>>s;
        int cwl = 0, crr =0,csw = 0,cer =0 ;
        int fr = -1, lw = -1;
        for(int i = 0 ; i < n*2 ; i ++){
            if(i<n && s[i] == 'W') cwl++;
            if(i>=n && s[i] == 'R') crr++;
            if(s[i] == 'R' && fr == -1) fr = i;
            if(s[i] == 'W') lw = i;
        }
        if(cwl % 2 || crr %2){
            cout << "NO\n";
            continue;
        }
        if(fr < cwl/2){
            cout << "NO\n";
            continue;
        }
        if(2*n-1-lw < crr/2){
            cout << "NO\n";
            continue;
        }
        cout<<"YES\n";
    }
}