Question: prague spring involved the warsaw pact invasion of
[{'answer': 'Czechoslovakia', 'provenance': [{'wikipedia_id': '15224410', 'title': 'Warsaw Pact invasion of Czechoslovakia', 'start_paragraph_id': 0, 'start_character': 24, 'end_paragraph_id': 0, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15224410', 'title': 'Warsaw Pact invasion of Czechoslovakia', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 419, 'bleu_score': 0.8737659664267621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11388004608287505062}, 'section': 'Section::::Background.:Prague Spring.\n'}]}]