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  1. or download this
    $time{2016}{November}{03}{sales} = 2500;
  2. or download this
    if(!defined $hash_ref->{$block}->{$libName}) {
   print "This is a test\n";
}
  3. or download this
    if(exists $hash_ref{$block} and !defined $hash_ref{$block}{$libName}) 
+{
   print "This is a test\n";
}