#include <stdio.h>

int main () {
  int t = 0;
  int n = 0;
  char c[2] = "";
  int d = 0;
  
  int res = 0;
  int flag[200000] = {};
  
  char cmap[3] = { 'B', 'G', 'R' };
  
  res = scanf("%d", &t);
  while (t > 0) {
    int cnt[8] = {};
    int b = 0;
    int ccnt[3] = {};
    res = scanf("%d", &n);
    for (int i = 0; i < n; i++) {
      flag[i] = 0;
    }
    for (int i = 0; i < n; i++) {
      res = scanf("%s", c);
      res = scanf("%d", &d);
      d--;
      for (int j = 0; j < 3; j++) {
        if (c[0] == cmap[j]) {
          flag[d] |= (1<<j);
          b |= (1<<j);
          ccnt[j]++;
        }
      }
    }
    for (int i = 0; i < n; i++) {
      cnt[flag[i]]++;
    }
    if ((b == 7 && (cnt[7] > 1 || (cnt[7] > 0 && (ccnt[0] <= 1 || ccnt[1] <= 1 || ccnt[2] <= 1 || cnt[3] > 0 || cnt[5] > 0 || cnt[6] > 0)) || (cnt[3] > 0 && (cnt[5] > 0 || cnt[6] > 0)) || (cnt[5] > 0 && cnt[6] > 0))) || (b != 7 && cnt[b] > 0)) {
      printf("YES\n");
    } else {
      printf("NO\n");
    }
    t--;
  }
  
  return 0;
}