public static String process ( char [ ] ch , int i , int j , Set < Character > set ) {
  for ( char p = 'A' ;
  p <= 'Z' ;
  p ++ ) {
    if ( set . contains ( p ) ) set . remove ( p ) ;
    else set . add ( p ) ;
  };
}

public static String process ( char [ ] ch , int i , int j , Set < Character > set ) { for ( char p = ' A ' ; p <= ' Z ' ; p ++ ) { if ( set . contains ( p ) ) set . remove ( p ) ; else set . add ( p ) ; } ; }
(method_declaration (modifiers) type: (type_identifier) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (generic_type (type_identifier) (type_arguments (type_identifier))) name: (identifier))) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (character_literal))) condition: (binary_expression left: (identifier) right: (character_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))))