Question: who teaches yoda to return through the force
[{'answer': 'spirit priestesses', 'provenance': [{'wikipedia_id': '63171', 'title': 'Yoda', 'start_paragraph_id': 42, 'start_character': 454, 'end_paragraph_id': 42, 'end_character': 472, 'bleu_score': 1.0, 'section': 'Section::::Appearances.:Animated series.:"Star Wars: The Clone Wars" (2008).\n'}]}, {'provenance': [{'wikipedia_id': '63171', 'title': 'Yoda', 'start_paragraph_id': 42, 'start_character': 0, 'end_paragraph_id': 42, 'end_character': 1041, 'bleu_score': 0.971959295179126, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8050940194608508319}, 'section': 'Section::::Appearances.:Animated series.:"Star Wars: The Clone Wars" (2008).\n'}]}]