import sys

# sys.setrecursionlimit(300005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# inf = 4294967295
md = 10**9+7
# md = 998244353

def solve():
    n = II()
    dd = [set(), set(), set()]
    for _ in range(n):
        c, d = SI().split()
        d = int(d)
        c = "RGB".find(c)
        dd[c].add(d)

    for c in range(3)[::-1]:
        if len(dd[c]) == 0: dd.pop(c)

    if len(dd) == 1: return True
    if len(dd) == 2:
        if dd[0] & dd[1]: return True
        return False

    ee = []
    for c in range(3):
        ee.append(dd[c-1] & dd[c])

    if sum(len(ee[c]) == 0 for c in range(3)) > 1: return False
    if len(ee[0] | ee[1] | ee[2]) == 1: return False
    return True

    # ***************************************

testnumber = II()
# testnumber = 1
for testcase in range(testnumber):
    # solve()
    print("YES" if solve() else "NO")
    # print("Yes" if solve() else "No")