import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
import math
import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
from collections import defaultdict
from collections import deque
#import copy #DeepCopy: hoge = [_[:] for _ in hogehoge]
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

def main():
    T = int(input())
    for _ in range(T):
        N = int(input())
        dic = defaultdict(list)
        R = set([]); G = set([]); B = set([])
        for i in range(N):
            c,d = input().split()
            d = int(d)
            dic[d].append(c)
            if c == 'R': R.add(d)
            if c == 'G': G.add(d)
            if c == 'B': B.add(d)
        
        RGB = set([])
        RG = set([]); GB = set([]); BR = set([])
        for v,L in dic.items():
            if len(L) == 3:
                RGB.add(v)
            elif len(L) == 2:
                if 'R' in L and 'G' in L:
                    RG.add(v)
                if 'G' in L and 'B' in L:
                    GB.add(v)
                if 'B' in L and 'R' in L:
                    BR.add(v)
        # 1色のみの場合
        if len(G) == len(B) == 0:
            print('YES')
        elif len(B) == len(R) == 0:
            print('YES')
        elif len(R) == len(G) == 0:
            print('YES')
        # 2色のみの場合
        elif len(R) == 0:
            if len(GB) >= 1:
                print('YES')
            else:
                print('NO')
        elif len(G) == 0:
            if len(BR) >= 1:
                print('YES')
            else:
                print('NO')
        elif len(B) == 0:
            if len(RG) >= 1:
                print('YES')
            else:
                print('NO')
        # 3色ある場合
        elif len(RGB) >= 2:
            print('YES')
        elif len(RGB) == 1:
            if len(RG) >= 1 or len(GB) >= 1 or len(BR) >= 1:
                print('YES')
            else:
                print('NO')
        else:
            if len(RG) >= 1 and len(GB) >= 1:
                print('YES')
            elif len(GB) >= 1 and len(BR) >= 1:
                print('YES')
            elif len(BR) >= 1 and len(RG) >= 1:
                print('YES')
            else:
                print('NO')


if __name__ == '__main__':
    main()