Question: what spacecraft used the gravitational pull of the planet jupiter
[{'answer': 'Voyager probes', 'provenance': [{'wikipedia_id': '155758', 'title': 'Gravity assist', 'start_paragraph_id': 2, 'start_character': 424, 'end_paragraph_id': 2, 'end_character': 438, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '155758', 'title': 'Gravity assist', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 476, 'bleu_score': 0.6014398873982221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6553600881713380735}, 'section': 'Section::::Abstract.'}]}]