#include <bits/stdc++.h>
// clang-format off
using namespace std; using ll=long long; using ull=unsigned long long; using pll=pair<ll,ll>; const ll INF=4e18;
void print0(){}; template<typename H,typename... T> void print0(H h,T... t){cout<<h;print0(t...);}
void print(){print0("\n");}; template<typename H,typename... T>void print(H h,T... t){print0(h);if(sizeof...(T)>0)print0(" ");print(t...);}
void perr0(){}; template<typename H,typename... T> void perr0(H h,T... t){cerr<<h;perr0(t...);}
void perr(){perr0("\n");}; template<typename H,typename... T>void perr(H h,T... t){perr0(h);if(sizeof...(T)>0)perr0(" ");perr(t...);}
void ioinit() { cout<<fixed<<setprecision(15); cerr<<fixed<<setprecision(6); ios_base::sync_with_stdio(0); cin.tie(0); }
#define debug1(a) { cerr<<#a<<":"<<a<<endl; }
#define debug2(a,b) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<endl; }
#define debug3(a,b,c) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<endl; }
#define debug4(a,b,c,d) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<" "<<#d<<":"<<d<<endl; }
// clang-format on

bool solve() {
    ll N;
    cin >> N;
    vector<vector<ll>> colors(3, vector<ll>(N + 1));
    unordered_set<ll> colorset;
    for (ll i = 0; i < N; i++) {
        char c;
        ll d;
        cin >> c >> d;
        ll cc = 0;
        if (c == 'R') cc = 0;
        if (c == 'G') cc = 1;
        if (c == 'B') cc = 2;
        colorset.insert(cc);
        colors[cc][d]++;
    }
    vector<ll> kinds(8);
    for (ll i = 1; i <= N; i++) {
        ll kind = 0;
        for (ll c = 0; c < 3; c++) {
            if (colors[c][i]) {
                kind += 1 << c;
            }
        }
        kinds[kind]++;
    }
    ll one = (kinds[1] > 0) + (kinds[2] > 0) + (kinds[4] > 0);
    ll two = (kinds[3] > 0) + (kinds[5] > 0) + (kinds[6] > 0);
    ll three = (kinds[7] > 0);
    ll all_color = colorset.size();
    if (all_color == 1) {
        return true;
    }
    if (all_color == 2) {
        if (two) return true;
        return false;
    }
    if (three) {
        if (two) return true;
        if (kinds[7] >= 2) return true;
        if (one <= 2) return true;
        return false;
    }
    if (two >= 2) return true;

    return false;
}
int main() {
    ioinit();
    ll T;
    cin >> T;
    while (T--) {
        print(solve() ? "YES" : "NO");
    }

    return 0;
}