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my @contacts = (
 {
  'firstname' => 'Joe',
  'lastname' => 'Doe',
  'email' => ['joe@somewhere.org', 'jdoe22@unity.ncsu.edu'],
  'employee_id' => 3342
 },
 {
  'firstname' => 'Jane',
  'lastname' => 'Doe',
  'email' => ['jane@somewhere.org'],
  'employee_id' => 7865
 }
);  
 my $serialized_data = YAML::Dump(\@contacts); 
 $self->data->set_variable('contacts', $serialized_data);