using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = int.Parse(ReadLine());
        var ans = new bool[t];
        for (var u = 0; u < t; ++u)
        {
            var n = int.Parse(ReadLine());
            var map = SList(n);
            ans[u] = Uno(n, map);
        }
        WriteLine(string.Join("\n", ans.Select(f => f ? "YES" : "NO")));
    }
    static bool Uno(int n, string[] map)
    {
        var b = new HashSet<int>();
        var g = new HashSet<int>();
        var r = new HashSet<int>();
        foreach (var card in map)
        {
            var d = int.Parse(card.Substring(2));
            if (card[0] == 'B') b.Add(d);
            else if (card[0] == 'G') g.Add(d);
            else r.Add(d);
        }
        return Check(b, g, r) || Check(b, r, g) || Check(r, b, g) || Check(r, g, b) || Check(g, b, r) || Check(g, r, b);
    }
    static bool Check(HashSet<int> list1, HashSet<int> list2, HashSet<int> list3)
    {
        if (list2.Count == 1)
        {
            if (list3.Count == 0)
            {
                foreach (var li in list2) if (list1.Contains(li)) return true;
            }
            else
            {
                foreach (var li in list2) if (list1.Contains(li) && list3.Contains(li)) return true;
            }
        }
        else if (list2.Count == 0)
        {
            if (list3.Count == 0) return true;
        }
        else
        {
            var f12 = new HashSet<int>();
            var f23 = new HashSet<int>();
            foreach (var li in list2)
            {
                if (list1.Contains(li)) f12.Add(li);
                if (list3.Contains(li)) f23.Add(li);
            }
            if (list3.Count == 0 && f12.Count > 0) return true;
            if (list3.Count > 0)
            {
                foreach (var f2 in f12) if (f23.Count - (f23.Contains(f2) ? 1 : 0) > 0) return true;
            }
        }
        return false;
    }
}