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use strict;
use Data::Dumper;
...
# Demo: 
print "Example: 1 -> ", h_error_symbol(1), " / ", hstrerror(1), "\n";
print Dumper(\%h_error_symbol);

Example: 1 -> HOST_NOT_FOUND / Authoritative Answer Host not found.
$VAR1 = {
...
          '4' => 'NO_DATA'
        };