Question: how many episodes in got season 7 pretty little liars
[{'answer': '20', 'provenance': [{'wikipedia_id': '27047499', 'title': 'List of Pretty Little Liars episodes', 'start_paragraph_id': 1, 'start_character': 78, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]