#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0;i<int(n);i++)
typedef long long ll;
typedef pair<ll,ll> P;


int main(void){
	int i;

	cin.tie(0);  ios_base::sync_with_stdio(false);

	int T;
	cin >> T;
	REP(tc,T){

		int N;
		cin >> N;
		vector<int> b,g,r;
		for(i=1;i<=N;i++){
			char c;
			int x;
			cin >> c >> x;
			if(c=='B') b.push_back(x);
			if(c=='G') g.push_back(x);
			if(c=='R') r.push_back(x);
		}

		int bb=b.size(),gg=g.size(),rr=r.size();

		bool f=false;

		if(bb==0 && gg==0) f=true;
		else if(gg==0 && rr==0) f=true;
		else if(rr==0 && bb==0) f=true;
		if(f){
			cout << "YES" << endl;
			continue;
		}

		sort(b.begin(),b.end());
		sort(g.begin(),g.end());
		sort(r.begin(),r.end());

		if(bb==0 && gg!=0 && rr!=0){
			REP(i,gg){
				if(binary_search(r.begin(),r.end(),g[i])){
					f=true;
					break;
				}
			}
			if(f) cout << "YES" << endl;
			else cout << "NO" << endl;
			continue;
		}

		if(bb!=0 && gg==0 && rr!=0){
			REP(i,bb){
				if(binary_search(r.begin(),r.end(),b[i])){
					f=true;
					break;
				}
			}
			if(f) cout << "YES" << endl;
			else cout << "NO" << endl;
			continue;
		}

		if(bb!=0 && gg!=0 && rr==0){
			REP(i,bb){
				if(binary_search(g.begin(),g.end(),b[i])){
					f=true;
					break;
				}
			}
			if(f) cout << "YES" << endl;
			else cout << "NO" << endl;
			continue;
		}


		if(bb==1 && gg==1 && rr==1){
			if(b[0]==g[0] && g[0]==r[0]) f=true;
			if(f) cout << "YES" << endl;
			else cout << "NO" << endl;
			continue;
		}

		vector<int> s,t;
		REP(i,bb) if(binary_search(g.begin(),g.end(),b[i])) s.push_back(b[i]);
		REP(i,bb) if(binary_search(r.begin(),r.end(),b[i])) t.push_back(b[i]);
		int n=s.size(),m=t.size();
		if(n!=0 && m!=0 && !(n==1 && m==1 && s[0]==t[0])) f=true;
		if(f){
			cout << "YES" << endl;
			continue;
		}

		s.clear(); t.clear();
		REP(i,gg) if(binary_search(b.begin(),b.end(),g[i])) s.push_back(g[i]);
		REP(i,gg) if(binary_search(r.begin(),r.end(),g[i])) t.push_back(g[i]);
		n=s.size(),m=t.size();
		if(n!=0 && m!=0 && !(n==1 && m==1 && s[0]==t[0])) f=true;
		if(f){
			cout << "YES" << endl;
			continue;
		}

		s.clear(); t.clear();
		REP(i,rr) if(binary_search(b.begin(),b.end(),r[i])) s.push_back(r[i]);
		REP(i,rr) if(binary_search(g.begin(),g.end(),r[i])) t.push_back(r[i]);
		n=s.size(),m=t.size();
		if(n!=0 && m!=0 && !(n==1 && m==1 && s[0]==t[0])) f=true;
		if(f){
			cout << "YES" << endl;
			continue;
		}


		cout << "NO" << endl;


	}



	return 0;
}