import sys
input = sys.stdin.readline

def f(c):
    if c == "R":
        return 0
    elif c == "G":
        return 1
    else:
        return 2

T = int(input())
for _ in range(T):
    N = int(input())
    S = [set() for i in range(3)]
    for i in range(N):
        C, n = input().split()
        n = int(n)
        S[f(C)].add(n)
    L = []
    for i in range(3):
        L.append((len(S[i]), S[i]))
    L.sort(reverse=True)
    S0, S1, S2 = L[0][1], L[1][1], L[2][1]
    if len(S2) == 0 and len(S1) == 0:
        print("YES")
        continue
    S01 = S1.intersection(S0)
    S02 = S2.intersection(S0)
    S12 = S1.intersection(S2)
    if len(S2) == 0 and S01:
        print("YES")
        continue
    if len(S01) >= 2 and (S02 or S12):
        print("YES")
        continue
    if len(S02) >= 2 and (S01 or S12):
        print("YES")
        continue
    if len(S12) >= 2 and (S02 or S01):
        print("YES")
        continue
    if S01 and S12 and len(S[1]) == 1:
        print("YES")
        continue
    if S02 and S12 and len(S[2]) == 1:
        print("YES")
        continue
    if S01 and S02 and len(S[0]) == 1:
        print("YES")
        continue
    print("NO")