You question has already been answered but I wanted to point this out. * What is the different between these, aggregation and associated?

If you aggregate one and two you get three. Aggregation is the combination of two things. Association means that things are in some way affiliated. So you might associate apples with fruit because they are part of that food group.

Aggregation is when a group or mass of something is taken all together/gathered together and considered as a whole or total amount. Association is when connected things/similar things are considered to be part of something bigger. They are recognized as being different but part of the same group. Hope this helps.