Question: in which mode the communication channel is used in both directions at the same time
[{'answer': 'A duplex', 'provenance': [{'wikipedia_id': '2112491', 'title': 'Duplex (telecommunications)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2112491', 'title': 'Duplex (telecommunications)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 513, 'bleu_score': 0.898300223385678, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2711349764652580556}, 'section': 'Section::::Abstract.'}]}]