# Populate a hash.
my %result = some_function(%data);

sub some_function {
  my %passed = @_;
  my %to_return;

  # Do stuff with %passed here and populate %to_return

  return %to_return;
}

##</code><code>##

my %distribution = degree_distribution();
my %random_distribution_1 = random_distribution();
my %random_distribution_2 = random_distribution();
my %random_distribution_3 = random_distribution();

output(%distribution);
output(%random_distribution_1);
output(%random_distribution_2);
output(%random_distribution_3);