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This subtemplate deals with a parameter which may be passed from elsewhere, and has an unknown format.
The template 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 "␢
".