The druid stones discovered in Ireland are very, very old. But this particular druid stone was discovered in Scotland; hence, it must be of more recent vintage. The argument is flawed because it ['allows a key term to shift in meaning from one use to the next', 'takes the fact that all members of a group have a certain property to constitute evidence that the members of the group are the only things with that property', 'takes for granted the very claim that it sets out to establish', 'takes the fact that most members of a group have a certain property to constitute evidence that all members of the group have that property']