Question: what are the duties of a church usher
[{'answer': 'seating guests', 'provenance': [{'wikipedia_id': '14441344', 'title': 'Church usher', 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 136, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'maintaining the order and security of services'}, {'provenance': [{'wikipedia_id': '14441344', 'title': 'Church usher', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 367, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12771038616400408492}, 'section': 'Section::::Abstract.'}]}]