code: def differences(a, b):
      """Returns objects that are only on a, b and both"""
      a = set(a)
      b = set(b)
  
      a_only = sorted(a - b)
      b_only = sorted(b - a)
      both = sorted(a & b)
  
      return both, a_only, b_only
  
label_desc: Use image node_id 1 for calling a global function with example usage: differences(a, b) and returns: both,  a_only,  b_only