Question: what are the four class levels in feudalism
[{'answer': 'the nobility', 'provenance': [{'wikipedia_id': '11298', 'title': 'Feudalism', 'start_paragraph_id': 3, 'start_character': 178, 'end_paragraph_id': 3, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the clergy', 'provenance': [{'wikipedia_id': '11298', 'title': 'Feudalism', 'start_paragraph_id': 3, 'start_character': 192, 'end_paragraph_id': 3, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the peasantry', 'provenance': [{'wikipedia_id': '11298', 'title': 'Feudalism', 'start_paragraph_id': 3, 'start_character': 208, 'end_paragraph_id': 3, 'end_character': 221, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11298', 'title': 'Feudalism', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 584, 'bleu_score': 0.9511135937842321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2491022741653882011}, 'section': 'Section::::Abstract.'}]}]