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

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