old_contents: from ApplianceTrace import *
  from ApplianceInstance import *
  from ApplianceType import *
  from ApplianceSet import *
  from utils import *
  
new_contents: from ApplianceTrace import ApplianceTrace
  from ApplianceInstance import ApplianceInstance
  from ApplianceType import ApplianceType
  from ApplianceSet import ApplianceSet
  import utils
  
subject: update disaggregator module