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# CGI post max
$CGI::POST_MAX = 4096;
...

# or (same) with implicit namespace of 'main'
$::age = 31;

use CGI qw/:standard/;

...
      start_html(),
      h3('hello'),
      end_html();

# no strict, so..
$age = 31
...
# is the same as these (in the 'main' script):
$::age = 31
$main::age = 31

$CGI::NPH=1