Question: other methods of layering aside from air layering
[{'answer': 'ground layering', 'provenance': [{'wikipedia_id': '2064083', 'title': 'Layering', 'start_paragraph_id': 3, 'start_character': 152, 'end_paragraph_id': 3, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2064083', 'title': 'Layering', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 555, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13880441133618255373}, 'section': 'Section::::Abstract.'}]}]