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Exercise 3.4: Using the program from Example 3.2 as a starting point, or starting from scratch if you prefer, do the following: a) A sodium chloride crystal has sodium and chlorine atoms arranged on a cubic lattice but the atoms alternate between sodium and chlorine, so that each sodium is surrounded by six chlorines and each chlorine is surrounded by six sodiums. Create a visualization of the sodium chloride lattice using two different colors to represent the two types of atoms. b) The face-centered cubic (fcc) lattice, which is the most common lattice in naturally occur- ring crystals, consists of a cubic lattice with atoms positioned not only at the corners of each cube but also at the center of each face: . Create a visualization of an foc lattice with a single species of atom (such as occurs in metallic iron, for instance).