static void go ( int mask , int a , int b ) {
  if ( ( mask & ( mask - 1 ) ) == 0 ) {
    out . print ( a + " " + b + " " ) ;
  }
  else {
    int c = Integer . lowestOneBit ( a ^ b ) ;
    int d = Integer . lowestOneBit ( mask ^ c ) ;
    go ( mask ^ c , a , a ^ d ) ;
    go ( mask ^ c , a ^ d ^ c , b ) ;
  }
}

static void go ( int mask , int a , int b ) { if ( ( mask & ( mask - 1 ) ) == 0 ) { out . print ( a + " ▁ " + b + " ▁ " ) ; } else { int c = Integer . lowestOneBit ( a ^ b ) ; int d = Integer . lowestOneBit ( mask ^ c ) ; go ( mask ^ c , a , a ^ d ) ; go ( mask ^ c , a ^ d ^ c , b ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (string_literal)) right: (identifier)) right: (string_literal)))))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)) (identifier) (binary_expression left: (identifier) right: (identifier))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)) (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) (identifier))))))))