public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int tc = sc . nextInt ( ) ;
  for ( int i = 0 ;
  i < tc ;
  i ++ ) {
    int n = sc . nextInt ( ) - 1 ;
    int m = sc . nextInt ( ) - 1 ;
    int r = sc . nextInt ( ) - 1 ;
    int c = sc . nextInt ( ) - 1 ;
    int max = 0 ;
    max = Math . max ( r + c , n - r + m - c ) ;
    max = Math . max ( max , n - r + c ) ;
    max = Math . max ( max , r + m - c ) ;
    System . out . println ( max ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int tc = sc . nextInt ( ) ; for ( int i = 0 ; i < tc ; i ++ ) { int n = sc . nextInt ( ) - 1 ; int m = sc . nextInt ( ) - 1 ; int r = sc . nextInt ( ) - 1 ; int c = sc . nextInt ( ) - 1 ; int max = 0 ; max = Math . max ( r + c , n - r + m - c ) ; max = Math . max ( max , n - r + c ) ; max = Math . max ( max , r + m - c ) ; System . out . println ( max ) ; } }
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