public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = sc . nextInt ( ) , m = sc . nextInt ( ) , x = sc . nextInt ( ) , y = sc . nextInt ( ) ;
    int best = Math . min ( 2 * x , y ) , ans = 0 ;
    char [ ] [ ] ar = new char [ n ] [ m ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      String s = sc . next ( ) ;
      for ( int j = 0 ;
      j < s . length ( ) ;
      j ++ ) ar [ i ] [ j ] = s . charAt ( j ) ;
    }
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      for ( int j = 0 ;
      j < m ;
      j ++ ) {
        if ( ar [ i ] [ j ] == '.' ) {
          if ( j == m - 1 ) {
            ans += x ;
            ar [ i ] [ j ] = '*' ;
          }
          else {
            if ( ar [ i ] [ j + 1 ] == '.' ) {
              ans += best ;
              ar [ i ] [ j ] = '*' ;
              ar [ i ] [ j + 1 ] = '*' ;
            }
            else {
              ans += x ;
              ar [ i ] [ j ] = '*' ;
            }
          }
        }
      }
    }
    System . out . println ( ans ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t -- > 0 ) { int n = sc . nextInt ( ) , m = sc . nextInt ( ) , x = sc . nextInt ( ) , y = sc . nextInt ( ) ; int best = Math . min ( 2 * x , y ) , ans = 0 ; char [ ] [ ] ar = new char [ n ] [ m ] ; for ( int i = 0 ; i < n ; i ++ ) { String s = sc . next ( ) ; for ( int j = 0 ; j < s . length ( ) ; j ++ ) ar [ i ] [ j ] = s . charAt ( j ) ; } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < m ; j ++ ) { if ( ar [ i ] [ j ] == ' . ' ) { if ( j == m - 1 ) { ans += x ; ar [ i ] [ j ] = ' * ' ; } else { if ( ar [ i ] [ j + 1 ] == ' . ' ) { ans += best ; ar [ i ] [ j ] = ' * ' ; ar [ i ] [ j + 1 ] = ' * ' ; } else { ans += x ; ar [ i ] [ j ] = ' * ' ; } } } } } System . out . println ( ans ) ; } }
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arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (decimal_integer_literal) right: (identifier)) (identifier)))) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: 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