code: func (s *DistinctNetSet) Remove(ip net.IP) {
  	key := s.key(ip)
  	if n, ok := s.members[string(key)]; ok {
  		if n == 1 {
  			delete(s.members, string(key))
  		} else {
  			s.members[string(key)] = n - 1
  		}
  	}
  }
docs: // Remove removes an IP from the set.