Question: numbers which do not make pairs are called
[{'answer': 'solitary', 'provenance': [{'wikipedia_id': '3821872', 'title': 'Friendly number', 'start_paragraph_id': 3, 'start_character': 57, 'end_paragraph_id': 3, 'end_character': 65, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3821872', 'title': 'Friendly number', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 65, 'bleu_score': 0.850733133512352, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 276755838371696394}, 'section': 'Section::::Abstract.'}]}]