A family can disapear in the outerspace
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.. objectives:: Objectives

   In this section we will learn:

   - what is a *property*
   - the `disabled` propety
   
   What is a disabled variable or family is, and why it is interesting to do that.

.. prerequisites:: Reminders

   - We have three variables: :confval:`proxy_mode`, :confval:`address` and :confval:`port`