t = int(input())

def f():
    n = int(input())
    s = input().strip()
    Wleft = s[:n].count("W")
    

    Wprefix = 0
    for char in s:
        if char == "W":
            Wprefix += 1
        else:
            break
    Rsuffix = 0
    for char in reversed(s):
        if char == "R":
            Rsuffix += 1
        else:
            break

    if Wleft % 2 == 1:
        print("NO")
        return
    
    if Wprefix < Wleft // 2:
        print("NO")
        return
    
    if Rsuffix + Wleft//2 + n-Wleft < n:
        print("NO")
        return

    print("YES")


for _ in range(t):
    f()