different kinds of abs?

I have noticed that many people have different kinds of abs. Some people have a nice big six pack(which i want) and some people have small kind of skinny abs all bunched together. I want to know what i have to do to get nice big abs?????????? any suggestions on what i should do?
 
Most of it is genetics. Assuming you already have a great workout plan and killer menu. You can increase the ab muscle size by doing weighted ab work. But I am not the best resource on doing that.
 
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