static void pattern ( int n , int num ) {
  pattern_upper ( n , num ) ;
  pattern_lower ( n - 1 , num ) ;
}

static void pattern ( int n , int num ) { pattern_upper ( n , num ) ; pattern_lower ( n - 1 , num ) ; }
(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))) body: (block (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier)))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier))))))