code: def difference(b, a):
      """Returns the elements of B that are not in A."""
      a = set(a)
      result = []
      for item in b:
          if item not in a:
              result.append(item)
      return result
  
imports: from b2.util import is_iterable
  from .utility import to_seq
label_desc: Use image node_id 1 for calling a global function with example usage: difference(b, a) and returns: result