'''package present''' ''?-'''''exact'''''? package ?version?''

This command is equivalent to '''[package require]''' except that it does not try and load the package if it is not already loaded.
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[etdxc] Sorry for being so literal, but I presume this means that it tries to load the package only when it is not already loaded.
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See also:

   * [package]
   * [package provide]
   * [package require]

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