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#!perl
use Data::Dumper;
my %hash = ( a=>{} );
if (  !exists $hash{'a'}{'b'}{'c'} ){};
print Dumper \%hash;

#return(\%lastKnownSigValH, \%scopesHierH, \%scopesH, \%timeRangeH, 
 #       \%timeIntervalBasedActivityH, $vcdFile, $timeUnits);
...
  $self->{timeIntervalBasedActivityH} = \%timeIntervalBasedActivityH; 
  $self->{vcdFile}   = $vcdFile; 
  $self->{timeUnits} = $timeUnits;

#!/usr/bin/perl
use strict;
...
  }
 
}