Name the number of series episode for s piston
{'header': ['Series Ep.', 'Episode', 'Netflix', 'Segment A', 'Segment B', 'Segment C', 'Segment D'], 'page_title': "List of How It's Made episodes", 'page_id': '', 'types': ['text', 'real', 'text', 'text', 'text', 'text', 'text'], 'id': '1-15187735-8', 'section_title': 'Season 8: 2006 2007', 'caption': 'Season 8: 2006 2007', 'rows': [['8-01', '92', 'S04E14', 's Photograph', 'Fur Tanning', 'Welding Electrodes', 'Electric Violins'], ['8-02', '93', 'S04E15', 'Glass Bottles', 's Hacksaw', 'Goalie Masks (Part 1)', 'Goalie Masks (Part 2)'], ['8-03', '94', 'S04E16', 'Lacrosse Sticks', 'Frozen Fish Products', 's Flashlight', 'es Paintbrush'], ['8-04', '95', 'S04E17', 'Deep Cycle Batteries', 'Tins', 'Optical Lenses (Part 1)', 'Optical Lenses (Part 2)'], ['8-05', '96', 'S04E18', 's Horseshoe', 's Dishwasher', 'Graphite s Fly Rod', 's Frozen Pizza'], ['8-06', '97', 'S04E19', 's Piston', 'Paint Rollers', 's Parachute', 's Chimney'], ['8-07', '98', 'S04E20', 'CO 2 Cartridges', 'Pretzels', 'Scissor Lifts', 's Skating Rink'], ['8-08', '99', 'S04E21', 's Pro Hockey Stick', 'Bronzed Baby Shoes', 's Treadmill', 's Handheld Computer'], ['8-09', '100', 'S04E22', 's Motorcycle', 'Clay Pipes', 'Drumsticks', 's Whistle'], ['8-10', '101', 'S04E23', 'Handcuffs', 'Caulking & Joint Compound', 'Propane Tanks', 'Forensic Facial Reconstruction'], ['8-11', '102', 'S04E24', 'Fur Coats', 's Hearse', 'Outdoor Lighting Fixtures', 'Golf Tees'], ['8-12', '103', 'S04E25', 'Fishing Reels', 'Miniature Houses', 'Kitchen Mixers (Part 1)', 'Kitchen Mixers (Part 2)']], 'name': 'table_15187735_8'}