import sys
input = sys.stdin.readline

TC=int(input())
for tc in range(TC):
    N=int(input())
    S=input().strip()

    pref_w=S[:N].find('R')
    if pref_w == -1:
        pref_w = N

    suff_r=S[::-1][:N].find('W')
    if suff_r == -1:
        suff_r = N
        
    lefthalf_w = S[:N].count('W')
    righthalf_r = S[N:].count('R')

    if lefthalf_w%2==0 and pref_w>=lefthalf_w//2 and righthalf_r%2==0 and suff_r>=righthalf_r//2:
        print("YES")
    else:
        print("NO")