#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define ln cout<<'\n'
#define ll long long
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.10f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}void pr(){ln;}
template<class A,class...B>void pr(const A &a,const B&...b){cout<<a<<(sizeof...(b)?" ":"");pr(b...);}
template<class A>void PR(A a,ll n){rep(i,n)cout<<(i?" ":"")<<a[i];ln;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[8]={-1,0,1,0,-1,-1,1,1},dy[8]={0,1,0,-1,-1,1,1,-1};
typedef pair<ll,ll> P;

int p[200001],r[200001];
void init(ll n){rep(i,n)p[i]=i,r[i]=0;}
int find(int x){return (p[x]==x)?x:(p[x]=find(p[x]));}
void unite(int x,int y) {
  x=find(x),y=find(y);
  if(x==y)return;
  if(r[x]<r[y])p[x]=y;
  else{p[y]=x;if(r[x]==r[y])r[x]++;}
}
bool same(int x,int y){return find(x)==find(y);}

void Main() {
  ll T;
  R T;
  while(T--) {
    ll n;
    cin >> n;
    init(n+3);
    ll c[n+3],e[n+3],d[n];
    mem(c);memset(e,-1,sizeof(e));
    P p[n];
    rep(i,n) {
      char ch;
      int y;
      cin >> ch >> y;
      y+=2;
      int x=0;
      if(ch=='B') x=1;
      else if(ch=='G') x=2;
      c[x]++;
      c[y]++;
      p[i]=P(x,y);
      if(e[x]!=-1) unite(e[x],i);
      if(e[y]!=-1) unite(e[y],i);
      e[x]=e[y]=i;
    }
    rep(i,n) d[i]=c[p[i].F]+c[p[i].S]-2;
    ll c1=0,c2=0;
    rep(i,n) {
      if(find(i)==i) c1++;
      if(d[i]==1) c2++;
    }
    if(c1==1&&(!c2||c2==2)) pr("YES");
    else pr("NO");
  }
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}