use strict;
use warnings;

seek DATA, 0, 0;
print while <DATA>;

__DATA__
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Prints:

use strict;
use warnings;

seek DATA, 0, 0;
print while <DATA>;

__DATA__
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Update Note that you must have either __END__ or __DATA__ at the end of the script (you may have data following that if you wish - it will be printed too).