In order to perceive information easier, people subconsciously divide big groups into small ones in their mind. The same method is used in schools where different charts and schemes help split and classify the information and this helps people remember it faster. Even though each girl is unique, they are still not the exception and can also be divided into 2 groups according to their different features.
from BrightSide RSS https://brightside.me/wonder-curiosities/18-photos-showing-that-there-are-only-2-types-of-girls-in-the-world-595810/
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