Which positions have made 4 touchdowns?
{'header': ['Player', 'Position', 'Starter', 'Touchdowns', 'Extra points', 'Field goals', 'Points'], 'page_title': '1904 Michigan Wolverines football team', 'section_title': 'Michigan 72, Physicians  &  Surgeons 0', 'caption': 'Michigan 72, Physicians  &  Surgeons 0', 'rows': [['Tom Hammond', 'Right tackle', 'Yes', '2', '12', '0', '22'], ['Norcross', 'Quarterback', 'Yes', '4', '0', '0', '20'], ['Heston', 'Left halfback', 'Yes', '3', '0', '0', '15'], ['Curtis', 'Left tackle', 'Yes', '1', '0', '0', '5'], ['Clark', 'Right end', 'Yes', '1', '0', '0', '5'], ['H. Hammond', 'Right halfback', 'Yes', '1', '0', '0', '5']]}