code: public function execute(Template $template, Context $context, $args, $source)
      {
          $arguments = $template->parseArguments($args);
          if (count($arguments) != 3) {
              throw new \InvalidArgumentException(
                  '"appendCountableSuffix" helper expects exactly 3 arguments.'
              );
          }
  
          return self::appendCountableSuffix($context->get($arguments[0]), $arguments[1], $arguments[2]);
      }
docs: {@inheritdoc}