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  1. or download this
       use strict;
       $a = 'woof';
       my $a = 'meow';
       print "lexical \$a: $a\n";
       print "package \$a: $main::a\n";
    
  2. or download this
       use strict;
       $a = 'woof';
    ...
       print "\$a: $a\n";
       print "package \$a: $main::a\n";
       print "ref to package \$\$a: $$a\n";