def create_answer(question: Concept, mapping: Mapping[Concept,
Concept]) -> Concept:
if mapping is None:
return None
# simple
if question.is_simple():
if question in mapping:
return mapping[question]
return question
# compound
ap = [] # type: list[Concept]
for p in question.parents:
ap.append(NLU.create_answer(p, mapping))
return Concept(question.name, question.relation, ap)
