import sys
input = sys.stdin.readline

for _ in range(int(input())):
    n = int(input())
    s = input().strip()
    w = [i for i in range(n) if s[i] == 'R']
    r = [i for i in range(n, 2 * n) if s[i] == 'W']
    a = [0] * (n * 2)
    for i in w + r:
        a[i] = 1
    l = [s[i] for i in range(2 * n) if a[i] == 0]
    if all(l[i] == l[i + 1] for i in range(0, len(l), 2)):
        print('YES')
    else:
        print('NO')