code: func (f *PrintFlags) AllowedFormats() []string {
  	formats := f.JSONYamlPrintFlags.AllowedFormats()
  	formats = append(formats, f.NamePrintFlags.AllowedFormats()...)
  	formats = append(formats, f.TemplateFlags.AllowedFormats()...)
  	formats = append(formats, f.CustomColumnsFlags.AllowedFormats()...)
  	formats = append(formats, f.HumanReadableFlags.AllowedFormats()...)
  	return formats
  }
docs: // AllowedFormats is the list of formats in which data can be displayed