Question: who is credited for creating a distinction between common and special cases of variation
[{'answer': 'Walter A. Shewhart', 'provenance': [{'wikipedia_id': '435399', 'title': 'Common cause and special cause (statistics)', 'start_paragraph_id': 1, 'start_character': 136, 'end_paragraph_id': 1, 'end_character': 154, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'W. Edwards Deming', 'provenance': [{'wikipedia_id': '435399', 'title': 'Common cause and special cause (statistics)', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '435399', 'title': 'Common cause and special cause (statistics)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 384, 'bleu_score': 0.933446922639073, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13605531542630556592}, 'section': 'Section::::Abstract.'}]}]