Consider some 4-sided dice. Roll two of these dice. Let X denote the minimum of the two

Question:

Consider some 4-sided dice. Roll two of these dice. Let X denote the minimum of the two values that appear, and let Y denote the maximum of the two values that appear.
a. Find the joint mass pX,Y(x,y) of X and Y.
b. Find the joint CDF FX,Y(x,y) of X and Y. It suffices to give the values FX,Y(x, y) when x and y are integers between 1 and 4. You do not have to list any other values; these 16 possibilities will suffice.