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#include <bits/stdc++.h>
using namespace std;
 
#define ms(s,n) memset(s,n,sizeof(s))
#define all(a) a.begin(),a.end()
#define present(t, x) (t.find(x) != t.end())
#define sz(a) int((a).size())
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define mp make_pair
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pi;
typedef vector<int> vi;
typedef vector<pi> vii;
 
const int MOD = (int) 1e9+7;
const int INF = (int) 1e9+1;
inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
 
 
void FileIO(){
	freopen("input.txt","r", stdin);
	freopen("output.txt","w",stdout);
}
 
bool check(int a[],int n){
	sort(a,a+n);
	int cnt_odd=0,cnt_even=0;
	for(int i=0;i<n;i++){
		if(a[i]%2==0){
			++cnt_even;
		}
		else ++cnt_odd;
	}
	if(cnt_odd%2 != cnt_even%2)
		return false;
	if(cnt_odd%2==0)
		return true;
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			if(a[i]%2!=a[j]%2 && abs(a[i]-a[j])==1)
				return true;
		}
	}
	return false;
}
int main(){
	//FileIO();
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int t;cin>>t;
	while(t--){
		int n;cin>>n;
		int a[n];
		FOR(i,0,n) cin>>a[i];
		if(check(a,n)) cout<<"YES\n";
		else cout<<"NO\n";
	}
}

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