from collections import Counter
T = int(input())
dic = {"R":0,"G":1,"B":2}
from collections import defaultdict
dic2 = defaultdict(lambda:[0,0,0])

def ok():
    print("YES")

def ng():
    print("NO")

def solve():
    N = int(input())
    dic2 = defaultdict(lambda: [0, 0, 0])
    Y = 0
    CN = [0] * 3
    for _ in range(N):
        c,d = input().split()
        if dic2[int(d)][dic[c]] < 2:
            dic2[int(d)][dic[c]] += 1
        CN[dic[c]] += 1
    D = Counter(CN)
    if D[0] == 2:
        ok()
        return

    if D[0] == 1:
        for i in range(3):
            if CN[i] == 0:
                a,b = (i+1)%3, (i+2)%3
        for x in dic2.values():
            if x[a] > 0 and x[b] > 0:
                ok()
                return
        ng()
        return

    for X in dic2.values():
        D = Counter(X)
        if D[0] > 1:
            continue
        elif D[0] == 1:
            for i in range(3):
                if X[i] == 0:
                    if Y == 0 or Y == i+1:
                        Y = i+1
                    else:
                        ok()
                        return
        elif D[1] == 3:
            if 1 in CN:
                ok()
                return
            else:
                Y = 4
        else:
            ok()
            return
    ng()

for _ in range(T):
    solve()