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  1. or download this
    my $filter = "filter";   # I'm a scalar here..
  2. or download this
    $hash{$filter[$c]->[4]}    # or am I an array?
  3. or download this
    '$hash{$filter[$c]->[4]}'   # that will literally be "$hash{$filter[$c
+]->[4]}"
  4. or download this
    $ ./booboo.pl 
Global symbol "$num_elements" requires explicit package name at ./boob
+oo.pl line 14.
...