Question: how many walker texas ranger seasons are there
[{'answer': 'Eight', 'provenance': [{'wikipedia_id': '391455', 'title': 'Walker, Texas Ranger', 'start_paragraph_id': 1, 'start_character': 360, 'end_paragraph_id': 1, 'end_character': 365, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '8', 'provenance': [{'wikipedia_id': '391455', 'title': 'Walker, Texas Ranger', 'start_paragraph_id': 1, 'start_character': 496, 'end_paragraph_id': 1, 'end_character': 497, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '391455', 'title': 'Walker, Texas Ranger', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1020, 'bleu_score': 0.9097538607156721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6201083831141413918}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '391455', 'title': 'Walker, Texas Ranger', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Eight full seasons followed with new episodes airing from September 25, 1993, to May 19, 2001, and reruns continuing on CBS until July 28, 2001.', 'Eight full seasons followed with new episodes airing from September 25, 1993, to May 19, 2001, and reruns continuing on CBS until July 28, 2001']}}]}]