Question: how many episodes season 4 pretty little liars
[{'answer': '24', 'provenance': [{'wikipedia_id': '38833431', 'title': 'Pretty Little Liars (season 4)', 'start_paragraph_id': 1, 'start_character': 157, 'end_paragraph_id': 1, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38833431', 'title': 'Pretty Little Liars (season 4)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 285, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12523692248943453469}, 'section': 'Section::::Abstract.'}]}]