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list_formats_for(locale, backend \\ nil)

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Returns the formats of list patterns available for a locale.

Returns a list of atoms of of the list formats that are available in CLDR for a locale.


iex> Cldr.List.list_formats_for("en", MyApp.Cldr)
[:or, :or_narrow, :or_short, :standard, :standard_narrow,
  :standard_short, :unit, :unit_narrow, :unit_short]