static void Maximum_xor_Triplet ( int n , int a [ ] ) {
  HashSet < Integer > s = new HashSet < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = i ;
    j < n ;
    j ++ ) {
      s . add ( a [ i ] ^ a [ j ] ) ;
    }
  }
  int ans = 0 ;
  for ( Integer i : s ) {
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      ans = Math . max ( ans , i ^ a [ j ] ) ;
    }
  }
  System . out . println ( ans ) ;
}

static void Maximum_xor_Triplet ( int n , int a [ ] ) { HashSet < Integer > s = new HashSet < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = i ; j < n ; j ++ ) { s . add ( a [ i ] ^ a [ j ] ) ; } } int ans = 0 ; for ( Integer i : s ) { for ( int j = 0 ; j < n ; j ++ ) { ans = Math . max ( ans , i ^ a [ j ] ) ; } } System . out . println ( ans ) ; }
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