Question: when did the grim adventures of billy and mandy end
[{'answer': 'October 12 , 2008', 'provenance': [{'wikipedia_id': '7216989', 'title': 'The Grim Adventures of Billy & Mandy', 'start_paragraph_id': 19, 'start_character': 3, 'end_paragraph_id': 19, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Media.:TV movies.\n'}]}, {'provenance': [{'wikipedia_id': '7216989', 'title': 'The Grim Adventures of Billy & Mandy', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 678, 'bleu_score': 0.607030142730111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11690865160885050735}, 'section': 'Section::::Abstract.'}]}]