Question: how many digits is a social security number
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '1551616', 'title': 'National identification number', 'start_paragraph_id': 66, 'start_character': 209, 'end_paragraph_id': 66, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::Americas.:United States of America.\n'}]}, {'provenance': [{'wikipedia_id': '1551616', 'title': 'National identification number', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 993, 'bleu_score': 0.9714607945780821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12052592907392134976}, 'section': 'Section::::Americas.:United States of America.\n'}]}]