#bracket.set  a category falling within certain defined limits
  supertype:  set.aggregation  a group of things of the same kind that belong together and are so used: "a set of books"; "a set of golf clubs"; "a set of teeth"
  subtype:  income_bracket__tax_bracket__taxbracket__income_tax_bracket  a category of taxpayers based on the amount of their income
  subtype:  price_bracket__pricebracket  a category of merchandise based on their price

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