#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

ll INF=2e18;

void solve() {

ll N;cin>>N;
string S;cin>>S;
for(ll i=0;i<N;i++) {
  ll a=i;
  ll b=i+1;
  ll c=i+2;
  a%=N;
  b%=N;
  c%=N;
  if(S[a]==S[b]&&S[b]==S[c]) {
    cout<<"NO"<<endl;
    return ;
  }

if(N>=5) {
  ll d=i-1;
  ll e=i-2;
  if(d<0) d+=N;
  if(e<0) e+=N;
  if(S[a]=='?'&&S[d]!='?'&&S[b]!='?') {
    if(S[d]!=S[b]&&S[d]==S[e]&&S[b]==S[c]) {
      cout<<"NO"<<endl;
      return ;
    }
  }
}
}

cout<<"YES"<<endl;

  


}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll t;cin>>t;
  for(ll i=0;i<t;i++) {
    solve();
  }

}