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  1. or download this
        1)  do $file is like eval `cat $file`, except the former
    1.1: searches @INC and updates %INC.
    1.2: bequeaths an *unrelated* lexical scope on the eval'ed code.
  2. or download this
    # file foo.pl
print $var,"\n";
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    # requiring code
$var = 'foo';
require 'foo.pl';
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    # requiring code
my $var = 'foo';
require 'foo.pl';
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    our $var;
for $var ( qw(foo bar quux) ) {
    require 'foo.pl';
}