def solve():
    n = int(input())
    colors = [set() for _ in range(n)]
    for _ in range(n):
        c, d = input().split()
        d = int(d)
        d -= 1
        colors[d].add(c)
    count_r = 0
    count_g = 0
    count_b = 0
    rg = 0
    gb = 0
    br = 0
    rgb = 0
    for cs in colors:
        if 'R' in cs:
            count_r += 1
        if 'G' in cs:
            count_g += 1
        if 'B' in cs:
            count_b += 1
        if cs == {'R', 'G'}:
            rg = 1
        if cs == {'G', 'B'}:
            gb = 1
        if cs == {'B', 'R'}:
            br = 1
        if cs == {'R', 'G', 'B'}:
            rgb += 1
    # 1 color
    if count_r + count_g == 0 or count_g + count_b == 0 or count_b + count_r == 0:
        return True
    # 2 colors
    if count_r == 0 or count_g == 0 or count_r == 0:
        return rg + gb + br > 0
    # 3 colors
    if rg + gb + br + rgb >= 2:
        return True
    if rgb == 0:
        return False
    return count_r == 1 or count_g == 1 or count_b == 1


t = int(input())
for _ in range(t):
    if solve():
        print('YES')
    else:
        print('NO')