static void remove ( int arr [ ] , int n ) {
  HashMap < Integer , Integer > mp = new HashMap < Integer , Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( mp . containsKey ( arr [ i ] ) ) {
      mp . put ( arr [ i ] , mp . get ( arr [ i ] ) + 1 ) ;
    }
    else {
      mp . put ( arr [ i ] , 1 ) ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( ( mp . containsKey ( arr [ i ] ) && mp . get ( arr [ i ] ) % 2 == 1 ) ) continue ;
    System . out . print ( arr [ i ] + ", " ) ;
  }
}

static void remove ( int arr [ ] , int n ) { HashMap < Integer , Integer > mp = new HashMap < Integer , Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( mp . containsKey ( arr [ i ] ) ) { mp . put ( arr [ i ] , mp . get ( arr [ i ] ) + 1 ) ; } else { mp . put ( arr [ i ] , 1 ) ; } } for ( int i = 0 ; i < n ; i ++ ) { if ( ( mp . containsKey ( arr [ i ] ) && mp . get ( arr [ i ] ) % 2 == 1 ) ) continue ; System . out . print ( arr [ i ] + " , ▁ " ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_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 (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (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: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal)) right: (decimal_integer_literal))))) consequence: (continue_statement)) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (string_literal)))))))))