public static void main ( String [ ] args ) throws IOException {
  PrintWriter pw = new PrintWriter ( System . out ) ;
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  for ( int y = 0 ;
  y < t ;
  y ++ ) {
    int r = sc . nextInt ( ) ;
    int c = sc . nextInt ( ) ;
    for ( int i = 0 ;
    i < r ;
    i ++ ) {
      for ( int j = 0 ;
      j < c ;
      j ++ ) {
        if ( i == 0 && j == 0 ) {
          pw . print ( "W" ) ;
        }
        else pw . print ( "B" ) ;
      }
      pw . println ( ) ;
    }
  }
  pw . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { PrintWriter pw = new PrintWriter ( System . out ) ; Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; for ( int y = 0 ; y < t ; y ++ ) { int r = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; for ( int i = 0 ; i < r ; i ++ ) { for ( int j = 0 ; j < c ; j ++ ) { if ( i == 0 && j == 0 ) { pw . print ( " W " ) ; } else pw . print ( " B " ) ; } pw . println ( ) ; } } pw . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) 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)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))