public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int [ ] arr = new int [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      arr [ i ] = sc . nextInt ( ) ;
    }
    Arrays . sort ( arr ) ;
    int mid = n / 2 , st = 0 ;
    if ( n % 2 != 0 ) {
      System . out . print ( arr [ mid ] + " " ) ;
      st += 1 ;
    }
    for ( int i = mid - 1 ;
    i >= 0 ;
    i -- ) {
      System . out . print ( arr [ mid + st ++ ] + " " + arr [ i ] + " " ) ;
    }
    System . out . println ( ) ;
  }
  sc . close ( ) ;
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int n = sc . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = sc . nextInt ( ) ; } Arrays . sort ( arr ) ; int mid = n / 2 , st = 0 ; if ( n % 2 != 0 ) { System . out . print ( arr [ mid ] + " ▁ " ) ; st += 1 ; } for ( int i = mid - 1 ; i >= 0 ; i -- ) { System . out . print ( arr [ mid + st ++ ] + " ▁ " + arr [ i ] + " ▁ " ) ; } System . out . println ( ) ; } sc . close ( ) ; }
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