Question: letter from birmingham jail promoted the principle of
[{'answer': 'nonviolent resistance to racism', 'provenance': [{'wikipedia_id': '356391', 'title': 'Letter from Birmingham Jail', 'start_paragraph_id': 1, 'start_character': 221, 'end_paragraph_id': 1, 'end_character': 252, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '356391', 'title': 'Letter from Birmingham Jail', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 545, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15669488172500938508}, 'section': 'Section::::Abstract.'}]}]