Question: when did the first tablet computer come out
[{'answer': '1956', 'provenance': [{'wikipedia_id': '28769705', 'title': 'History of tablet computers', 'start_paragraph_id': 3, 'start_character': 156, 'end_paragraph_id': 3, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28769705', 'title': 'History of tablet computers', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 458, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4514134133410818808}, 'section': 'Section::::Early tablets.\n'}]}]