// Problem: C. Challenging Cliffs
// Contest: Codeforces - Codeforces Round #726 (Div. 2)
// URL: https://codeforces.com/contest/1537/problem/C
// Memory Limit: 256 MB
// Time Limit: 2000 ms
//
// Powered by CP Editor (https://cpeditor.org)
#include "bits/stdc++.h"
#define FIO ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace std;
using ll = long long;
int main(){
FIO
ll t ; cin >> t ;
while(t--){
ll n ; cin>> n ;
vector<ll> v(n , 0 ) ;
for(auto &c : v)cin>> c;
sort(v.begin() , v.end()) ;
ll Min = INT_MAX , idx = -1 ;
for(int i = 1 ; i < n ;i++){
if(Min > (v[i]-v[i-1])){
Min = (v[i]-v[i-1]) ;
idx = i ;
}
}
cout<< v[idx-1] <<" " ;
for(int i = idx+1 ; i < n ;i++ ){
cout << v[i] << " " ;
}
for(int i = idx-2 ; i >= 0 ; i--){
cout << v[i] <<" " ;
}
cout<<v[idx] << "\n" ;
}
return 0 ;
}
