doc/examples/preferences

   1 Package:  *
   2 Pin:  release a=stable
   3 Pin-Priority:  500
   4
   5 Package:  *
   6 Pin:  release a=testing
   7 Pin-Priority:  101
   8
   9 Package:  *
  10 Pin:  release a=unstable
  11 Pin-Priority:  99