#include<bits/stdc++.h>
using namespace std;
using lint=long long;
#define rep(i,n) for(int i=0;i<int(n);++i)
#define all(n) (n).begin(),(n).end()

void solve(){
    lint n;
    cin>>n;
    vector<string>s(n);
    vector<lint>cnt(3);
    set<pair<lint,char>>ss;
    rep(i,n){
        string tmp;
        char c;
        lint j;
        cin>>tmp>>j;
        c=tmp[0];
        j--;
        if(ss.count(make_pair(j,c))){
            assert(0);
        }
        ss.emplace(j,c);
        assert(0<=j&j<n);
        s[j]+=c;
        string t="BGR";
        rep(k,3){
            if(t[k]==c){
                cnt[k]++;
            }
        }
    }
    assert(cnt[0]+cnt[1]+cnt[2]==n);
    rep(i,n)sort(all(s[i]));
    sort(all(s));
    lint p=count(all(s),"GR");
    lint q=count(all(s),"BR");
    lint r=count(all(s),"BG");
    if((p&&q)||(q&&r)||(r&&p)){
        cout<<"YES"<<endl;
    }else if((p||q||r)&&count(all(s),"BGR")){
        cout<<"YES"<<endl;
    }else if(count(all(s),"BGR")&&*min_element(all(cnt))==1){
        cout<<"YES"<<endl;
    }else if((p&&cnt[0]==0)||(q&&cnt[1]==0)||(r&&cnt[2]==0)){
        cout<<"YES"<<endl;
    }else if((cnt[0]==n)||(cnt[1]==n)||(cnt[2]==n)){
        cout<<"YES"<<endl;
    }else{
        cout<<"NO"<<endl;
    }
}
int main(){
    int t;
    cin>>t;
    while(t--)solve();
}