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  1. or download this
    $var = "value";
print($main::var eq "value" ? "true" : "false", "\n");  # true
  2. or download this
    our $var = "value";
print($main::var eq "value" ? "true" : "false", "\n");  # true
  3. or download this
    package Test;
$var = "value";
print($Test::var eq "value" ? "true" : "false", "\n");  # true
  4. or download this
    our $var;
package Test;
$var = "value";
print($Test::var eq "value" ? "true" : "false", "\n");  # false