[NTG-context] how to write two or three single hyphens?

Hello, describing linux file permissions I would like to write rwx------ As I expected the hyphens are converted to two long dashes (excuse me if I missed the correct name), so I tried something like this rwx{-}{-}{-}{-}{-}{-} or rwx{}-{}-{}-{}-{}-{}- which works in latex, but in context I'm still getting the long dashes. How can I prevent this conversion, please? regards Jan -- Tato zpráva byla vytvořena převratnou poštovní aplikací Opery: http://www.opera.com/mail/