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   The Exclude button allows to exclude the selected object from both the
   link and make file.

   If the entity is added by using the Include button, and therefore it
   does not make part of the current sub-project, it is simply removed from
   the link script.

   But if the entity makes part of the current sub-project, it is not only
   removed from the make and link script, but also from the sub-project
   itself. Pay much attention when using this button in order to avoid
   undesired deletions.