Question: which dynasty stopped the expansion of the pratiharas into the deccan
[{'answer': 'Vatsraja', 'provenance': [{'wikipedia_id': '870663', 'title': 'Gurjara-Pratihara dynasty', 'start_paragraph_id': 13, 'start_character': 523, 'end_paragraph_id': 13, 'end_character': 531, 'bleu_score': 1.0, 'section': 'Section::::History.:Early rulers.\n'}]}, {'provenance': [{'wikipedia_id': '870663', 'title': 'Gurjara-Pratihara dynasty', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 718, 'bleu_score': 0.9601968849001611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5278094824093962260}, 'section': 'Section::::History.:Conquest of Kannauj and further expansion.\n'}]}]