Question: how many episodes of happy valley season 2
[{'answer': 'six', 'provenance': [{'wikipedia_id': '49164851', 'title': 'List of Happy Valley episodes', 'start_paragraph_id': 1, 'start_character': 146, 'end_paragraph_id': 1, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49164851', 'title': 'List of Happy Valley episodes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 439, 'bleu_score': 0.9751504244977051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4108062558692042711}, 'section': 'Section::::Abstract.'}]}]