you are passing a hash reference to a subrouting. you need the parentesis to dereference this reference inside of the subroutine and fill the has you going to use later. According to a later use of this data it may be better to work with this reference instead to copy all the data to other hash. For detailed explanation read perlreftut.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
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