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1. NAME(LIST); # & is optional with parentheses.
2. NAME LIST; # Parentheses optional if predeclared/imported.
3. &NAME(LIST); # Circumvent prototypes.
4. &NAME; # Makes current @_ visible to called subroutine.
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5.003 (Camel Book 2nd Edition)
5.6 (Camel Book 3rd Edition)
5.8 (stable version for >5 years)
5.10 (many new features now in common use)
5.16 (Camel Book 4th Edition)
5.18 (hash overhaul)
5.26 (no "." in @INC)
5.36 (subroutine signatures)
Dynamic (no standard; code dictates VERSION)
Other (discuss in comments)
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