Question: the number of shafts provided in heavy duty vehicles gear box is normally
[{'answer': 'There are usually three shafts', 'provenance': [{'wikipedia_id': '609147', 'title': 'Transmission (mechanics)', 'start_paragraph_id': 24, 'start_character': 184, 'end_paragraph_id': 24, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::Multi-ratio systems.:Automotive basics.\n'}]}, {'provenance': [{'wikipedia_id': '609147', 'title': 'Transmission (mechanics)', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 263, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8383797066840654249}, 'section': 'Section::::Multi-ratio systems.:Automotive basics.\n'}]}]