github.com/gotd/td/tg.HelpCountriesListArray.Retain (method)

one use

	github.com/gotd/td/tg (current package)
		tl_help_countries_list_slices_gen.go#L207: func (s HelpCountriesListArray) Retain(keep func(x HelpCountriesList) bool) HelpCountriesListArray {

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