Question: when was the book song of songs written
[{'answer': 'late 6th century BCE', 'provenance': [{'wikipedia_id': '28582', 'title': 'Song of Songs', 'start_paragraph_id': 27, 'start_character': 395, 'end_paragraph_id': 27, 'end_character': 415, 'bleu_score': 1.0, 'section': 'Section::::Composition.\n'}]}, {'provenance': [{'wikipedia_id': '28582', 'title': 'Song of Songs', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 947, 'bleu_score': 0.9786516031679311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14318055708517725588}, 'section': 'Section::::Composition.\n'}]}]