Question: how many seasons of happy tree friends are there
[{'answer': '5', 'provenance': [{'wikipedia_id': '9714048', 'title': 'List of Happy Tree Friends episodes', 'start_paragraph_id': 15, 'start_character': 45, 'end_paragraph_id': 15, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Unnumbered episodes and shorts.:Smoochies (2003–2008).\n'}]}, {'provenance': [{'wikipedia_id': '9714048', 'title': 'List of Happy Tree Friends episodes', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 597, 'bleu_score': 0.722327754899134, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14412484744524199127}, 'section': 'Section::::Abstract.'}]}]