public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int test = scan . nextInt ( ) ;
  for ( int i = 0 ;
  i < test ;
  i ++ ) {
    int a = scan . nextInt ( ) ;
    int b = scan . nextInt ( ) ;
    for ( int k = 0 ;
    k < a ;
    k ++ ) {
      for ( int j = 0 ;
      j < b ;
      j ++ ) {
        if ( k == 0 && j == 0 ) {
          System . out . print ( "W" ) ;
        }
        else {
          System . out . print ( "B" ) ;
        }
      }
      System . out . println ( "" ) ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int test = scan . nextInt ( ) ; for ( int i = 0 ; i < test ; i ++ ) { int a = scan . nextInt ( ) ; int b = scan . nextInt ( ) ; for ( int k = 0 ; k < a ; k ++ ) { for ( int j = 0 ; j < b ; j ++ ) { if ( k == 0 && j == 0 ) { System . out . print ( " W " ) ; } else { System . out . print ( " B " ) ; } } System . out . println ( " " ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (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: (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: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))))))))