static void print ( int n ) {
  System . out . println ( n + n / 2 ) ;
  for ( int i = 2 ;
  i <= n ;
  i += 2 ) System . out . print ( i + " " ) ;
  for ( int i = 1 ;
  i <= n ;
  i += 2 ) System . out . print ( i + " " ) ;
  for ( int i = 2 ;
  i <= n ;
  i += 2 ) System . out . print ( i + " " ) ;
}

static void print ( int n ) { System . out . println ( n + n / 2 ) ; for ( int i = 2 ; i <= n ; i += 2 ) System . out . print ( i + " ▁ " ) ; for ( int i = 1 ; i <= n ; i += 2 ) System . out . print ( i + " ▁ " ) ; for ( int i = 2 ; i <= n ; i += 2 ) System . out . print ( i + " ▁ " ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (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: (assignment_expression left: (identifier) right: (decimal_integer_literal)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal)))))) (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: (assignment_expression left: (identifier) right: (decimal_integer_literal)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal)))))) (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: (assignment_expression left: (identifier) right: (decimal_integer_literal)) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal))))))))