6. In 2-D crystal systems, there are 4 distinguishable ways of arrangement (square, rectangle, hexagon, and oblique). If we consider point locations (i.e., Bravais lattice), then there are 5 distinguishable ways of arrangenent depicted below. a) Show/explain why centered square is not a Bravais lattice, but Simple square is (use drawings below to demonstrate). 15 b) The 2.D images below are of the wall of 2.001 Lecture room at MEC building. By analyzing them, the fundamentals of the unit cell and erystal system can be clearly understood. Determine the Bravais lattice for both the images. Assumption: Different colors represent different brick materials. 15