import sys
input = sys.stdin.readline
from itertools import *

for _ in range(int(input())):
    N = int(input())
    L = [[] for _ in range(3)]
    
    for _ in range(N):
        C, D = input().split()
        D = int(D)
        
        if C=='R':
            L[0].append(D)
        elif C=='G':
            L[1].append(D)
        else:
            L[2].append(D)
    
    x = 3-[len(L[0]), len(L[1]), len(L[2])].count(0)
    
    if x==1:
        print('YES')
    elif x==2:
        l = [i for i in range(3) if len(L[i])>0]
        
        if len(set(L[l[0]])&set(L[l[1]]))>0:
            print('YES')
        else:
            print('NO')
    else:
        ok = False
        
        for p in permutations(range(3)):
            if len(L[p[1]])==1:
                if L[p[1]][0] in L[p[0]] and L[p[1]][0] in L[p[2]]:
                    ok = True
            else:
                s1 = set(L[p[0]])&set(L[p[1]])
                s2 = set(L[p[1]])&set(L[p[2]])
                
                if len(s2)==0:
                    continue
                elif len(s2)>1:
                    if len(s1)>0:
                        ok = True
                else:
                    if len(s1)==1 and list(s1)[0]!=list(s2)[0]:
                        ok = True
                    elif len(s1)>1:
                        ok = True
        
        if ok:
            print('YES')
        else:
            print('NO')