A general form of reasoning involves replacing particular things with typical things. Memory agents to this by 'moving memories around'. "Children must develop complex skills, not merely to replace one representation with another, but to compare the two representations and then move around inside them, making different changes at different levels. These intricate skills involve the use of isonomes that control the level-band of the activities inside our agencies." But we don't know much about how such processes work.
NB: Again, difference detection seems to be at the heart of this. Perhaps encoding differences, instead of "facts", is the key to knowledge representation.