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        do foo(1,2,3);          # pass three arguments
        &foo(1,2,3);            # the same

        do foo();               # pass a null list
        &foo();                 # the same
        &foo;                   # pass no arguments--more efficient

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    NAME(LIST);    # & is optional with parentheses.
    NAME LIST;     # Parentheses optional if predeclared/imported.
    &NAME(LIST);   # Circumvent prototypes.
    &NAME;         # Makes current @_ visible to called subroutine