[['series ep', 'episode', 'segment a', 'segment b', 'segment c', 'segment d'], ['21 - 01', '261', 'rubber gloves', 'soap carvings', 'aircraft cabinets', 'motorcycle brake locks'], ['21 - 02', '262', 'powder horns', 'handcrafted moulds', 'perogies', 'inner tubes'], ['21 - 03', '263', 'lace', 'antique frame replicas', 'orchids', 'unicycle wheel hubs'], ['21 - 04', '264', 'external hard drives', 'frozen shrimp', 'thai rice boxes', 'paper towels'], ['21 - 05', '265', 'tea', 'roof finials', 'artificial flowers', 'alloy wheels'], ['21 - 06', '266', 'gel caps', 'playground spring riders', 'frozen pancakes', 'natural rubber'], ['21 - 07', '267', 'paper umbrellas', 'coal', 'aircraft seats', 's cremation urn'], ['21 - 08', '268', 'aluminium s canoe', 'wooden stave bowls', 'wheelchair accessible vans', 's marimba'], ['21 - 09', '269', 'indy car seats', 'paper flowers', 'standby generators (part 1)', 'standby generators (part 2)'], ['21 - 10', '270', 'customized knee replacements', 'leaf springs', 'lavender essential oil', 'rivets and rivet tools'], ['21 - 11', '271', 'cast iron stoves', 'ultralight aircraft', 'snow groomers', 'rubber bands'], ['21 - 12', '272', 'barber chairs', 'sewage pumps', 'bimini boat tops', 'diesel filters'], ['21 - 13', '273', 'car tires', 'silk', 'art conservation', 'scuba tanks']]
they have covered topic such as Customized Knee Replacement and Wheelchair Accessible Van
they have covered topic such as [ENT] and [ENT]