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This subtemplate checks: when the 1st parameter is a "-" (minus/hyphen), nothing is done;
otherwise it checks whether the 1st parameter starts with "[[Cat":

  • if yes, it is passed for categorizing as-it-is;
  • if not, it is preceded with "[[Category:"
and trailed with (an optional sorting item and) "]]", and then passed.

The 2nd parameter may be any sorting item:

  • to avoid: don't define it, or define as "-";
  • to use a space: define empty "2=", or " " or "".