├ sport
│    └ American football
│       ├ helmet
│       ├ shoulder pad
│       ├ glove (esp. sports)
│       ├ warm-up wear
│       ├ shirt (underwear)
│       ├ pants
│       ├ Accessory
│       ├ replica uniform
│       ├ commemorative goods
│       └ Other football equipment
      └ American football
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