Question: which country was invited to the london olympics 1948 but did not attend
[{'answer': 'Soviet Union', 'provenance': [{'wikipedia_id': '42196', 'title': '1948 Summer Olympics', 'start_paragraph_id': 3, 'start_character': 623, 'end_paragraph_id': 3, 'end_character': 635, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42196', 'title': '1948 Summer Olympics', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 728, 'bleu_score': 0.791920863768635, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13127333373053941289}, 'section': 'Section::::Abstract.'}]}]