Answer:
The answer is illustrations/examples
Step-by-step explanation:
Think of carving a sculpture. When carving you will start by chipping away at big chunks of clay, this is your main points. Then after the big chunks of clay are gone you will start to create the shape of your sculpture. You will chisel away at your clay with a more precise tool which are your sub-points. After the figure of your sculpture is defined you will start to create more details, this is your illustrations/examples.
Btw I've never sculpted anything but I generally know how to I guess. Also if that explanation wasn't enough for you, I just answer that question on a quiz and it said I was right so...