text: import sys
  import json
  
  j = json.load(sys.stdin)
  include = j[sys.argv[1]]
  
  # 1st arg = set to include
  # if 2nd arg = filter out these from the set into include before generating the inventory
  
  if len(sys.argv) == 3:
      res = ','.join(set(include) - set(j[sys.argv[2].replace('-', '_')]))
      print res + ',' if res else ''
  else:
      res = ','.join(include)
      print res + ',' if res else ''
  