5. [12 pts] 2 fair 4-sided \"die\" are tossed. Let S be the smaller number of points shown on a die. Let L be the larger number of points shown on a die. If both dice show the same number, say, n points, then S = L = n. 5.1. [3 pts] Find the joint probability mass function of (S, L). 5.2. [3 pts] Are S and L independent? Explain. 5.3. [3 pts] Find the probability mass function of S. 5.4. [3 pts] If S = 2, what is the probability that L = 4