#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int t;
    cin >> t;
    rep(_,t){
        int n;
        cin >> n;
        vector<int> a(n);
        rep(i,n) cin >> a[i];
        vector<int> cnt(3);
        rep(i,n) cnt[a[i]]++;
        bool ok = true;
        rep(i,n-1){
            if(a[i]!=1 && a[i]==a[i+1]) ok = false;
        }
        if(cnt[0]>=1 && cnt[2]>=1 && accumulate(cnt.begin(),cnt.end(),0) == n && ok){
            cout << "Yes" << endl;
        }
        else{
            cout << "No" << endl;
        }
    }

    return 0;
}