I try to learn about SW and I follow a certification sample question online to draw a part. I attached two pictures. One is the certification sample question, the other one is what I draw. I have checked my answer, it matches with solution.

After that I try to learn about annotation (auto dimensioning) using Dimxpert, you will see [[[3.92 x 3.94]]] if you see the picture that I draw. I try to find out what it means. It is chamfer x chamfer, but I have no clue why and how the chamfer defines in that area. Please help