Question: when is the last time for the gridworld case study to be tested
[{'answer': '2014', 'provenance': [{'wikipedia_id': '3983341', 'title': 'AP Computer Science A', 'start_paragraph_id': 101, 'start_character': 41, 'end_paragraph_id': 101, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Case studies and labs.\n'}]}, {'provenance': [{'wikipedia_id': '3983341', 'title': 'AP Computer Science A', 'start_paragraph_id': 112, 'start_character': 0, 'end_paragraph_id': 112, 'end_character': 493, 'bleu_score': 0.92959410412591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6500263876388077147}, 'section': 'Section::::Case studies and labs.:Case studies (discontinued).:GridWorld case study (2008-2014).\n'}]}]