anchor.diff:                     ]
                  )
   
  -    nodes = response['Reservations']
  +    hosts = []
   
  -    hosts = []
  -    for instance in nodes:
  -        hosts.append((instance['Instances'][0]['PrivateDnsName']))
  +    reservations = response['Reservations']
  +    for reservation in reservations:
  +        instances = reservation['Instances']
  +        for instance in instances:
  +            hosts.append((instance['PrivateDnsName']))
   
       return(hosts)
   
  
positive.code:            ]
         )
  
      nodes = response['Reservations']
  
      classes = []
      for instance in nodes:
          classes.append(list(filter(lambda t: t['Key'] == 'aws_migration', instance['Instances'][0]['Tags']))[0]['Value'])
  
      return(sorted(set(classes)))
  
  
negative.code:                    ]
                 )
  
      reservations = response['Reservations']
      for reservation in reservations:
          instances = reservation['Instances']
  
      return [
          "%s:%s" % (
              instance['PrivateDnsName'],
              next(
                  filter(
                      lambda t: t['Key'] == 'aws_hostname',
                      instance['Tags']
                  )
              )['Value']
          )
          for instance in list(instances)
      ]
  
  def ec2_classes(stackname):
  