text: #include <bits/stdc++.h>
  using namespace std;
  
  void findZigZagSequence(vector < int > a, int n){
      sort(a.begin(), a.end());
      int mid = n/2;
      swap(a[mid], a[n-1]);
  
      int st = mid + 1;
      int ed = n - 2;
      while(st <= ed){
          swap(a[st], a[ed]);
          st = st + 1;
          ed = ed - 1;
      }
      for(int i = 0; i < n; i++){
          if(i > 0) cout << " ";
          cout << a[i];
      }
      cout << endl;
  }
  
  int main() {
      int n, x;
      int test_cases;
      cin >> test_cases;
  
      for(int cs = 1; cs <= test_cases; cs++){
          cin >> n;
          vector < int > a;
          for(int i = 0; i < n; i++){
              cin >> x;
              a.push_back(x);
          }
          findZigZagSequence(a, n);
      }
  }
  
  
  
  