Why there are 3 versions of glew32 lib's?

Hey , working on the windows / desktop part
i can see there are 3 kinds of glew lib’s in Debug.win32
glew32.lib
glfw3.lib
glfw3-2015.lib

also in code i can see there are includes
from CCGL-win32.h to #include “GL/glew.h”
then in CCGLViewImpl-desktop.h there is include to #include “glfw3.h”
which is which and what is the logic ?

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