Question: according to hindu mythology how many yugas are there
[{'answer': 'four Yugas in one cycle', 'provenance': [{'wikipedia_id': '175075', 'title': 'Yuga', 'start_paragraph_id': 3, 'start_character': 10, 'end_paragraph_id': 3, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Four yugas.\n'}]}, {'provenance': [{'wikipedia_id': '175075', 'title': 'Yuga', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 33, 'bleu_score': 0.725979529115477, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10294326634190978221}, 'section': 'Section::::Four yugas.\n'}]}]