Question: the part of russia east of the ural mountains is known as
[{'answer': 'The West Siberian Plain', 'provenance': [{'wikipedia_id': '25702', 'title': 'Geography of Russia', 'start_paragraph_id': 40, 'start_character': 61, 'end_paragraph_id': 40, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Topography and drainage.:Ecoregions.:East European plain.\n'}]}, {'provenance': [{'wikipedia_id': '25702', 'title': 'Geography of Russia', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 411, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2790116235541527012}, 'section': 'Section::::Topography and drainage.:Ecoregions.:East European plain.\n'}]}]