Question: what is the highest value that can be represented by a nibble
[{'answer': 'sixteen', 'provenance': [{'wikipedia_id': '21150', 'title': 'Nibble', 'start_paragraph_id': 1, 'start_character': 292, 'end_paragraph_id': 1, 'end_character': 299, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21150', 'title': 'Nibble', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 401, 'bleu_score': 0.9357502588195491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10018197586300231828}, 'section': 'Section::::Abstract.'}]}]