#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

constexpr int C = 3;
const map<char, int> colors{
  {'B', 0},
  {'G', 1},
  {'R', 2}
};

bool solve() {
  int n; cin >> n;
  set<int> cards[C]{};
  while (n--) {
    char c; int d; cin >> c >> d;
    cards[colors.at(c)].emplace(d);
  }
  sort(cards, cards + C, [](const set<int>& a, const set<int>& b) -> bool { return a.size() > b.size(); });
  if (cards[1].empty()) return true;
  if (cards[2].empty()) {
    vector<int> res;
    set_intersection(ALL(cards[0]), ALL(cards[1]), back_inserter(res));
    return !res.empty();
  }
  int order[C]{};
  iota(order, order + C, 0);
  do {
    vector<int> a, b;
    set_intersection(ALL(cards[order[0]]), ALL(cards[order[1]]), back_inserter(a));
    set_intersection(ALL(cards[order[1]]), ALL(cards[order[2]]), back_inserter(b));
    if (b.empty()) continue;
    for (const int i : a) {
      if (b.size() == 1) {
        if (cards[order[1]].size() == 1 || b.front() != i) return true;
      } else {
        return true;
      }
    }
  } while (next_permutation(order, order + C));
  return false;
}

int main() {
  int t; cin >> t;
  while (t--) cout << (solve() ? "YES\n" : "NO\n");
  return 0;
}