withoutPort = append(withoutPort, d)
			}
		}
	}
	withoutPort = unexpandDomains(withoutPort)
	if len(withoutPort) > maximum {
		ret := strings.Join(withoutPort[:maximum], ", ")
		return fmt.Sprintf("%s + %d more...", ret, len(withoutPort)-maximum)
	}
	return strings.Join(withoutPort, ", ")
}

func unexpandDomains(domains []string) []string {
	unique := sets.New(domains...)