Question: formal balance is another word for which type of balance
[{'answer': 'symmetrical balance', 'provenance': [{'wikipedia_id': '33760922', 'title': 'Formal balance', 'start_paragraph_id': 1, 'start_character': 28, 'end_paragraph_id': 1, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33760922', 'title': 'Formal balance', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 155, 'bleu_score': 0.9146912192286941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12049145219364003430}, 'section': 'Section::::Abstract.'}]}]