Compare the Prolog program for quicksort in Figure 4.9 with the Haskell version in Section 3.5. What are the differences? What are the similarities?

qsort ([], []). qsort ([HT], S) - partition (H, T, L, R), qsort (L, L1), qsort (R, R1), append (L1, [H|R1], S). partition (P, [A]X], [A|Y], Z) :- A < P, partition (P, X, Y, Z). partition (P, [A\X], Y, [A]Z]) :- - A >= P, partition (P, [], [], []). partition (P, X, Y, Z). Figure 4.9 A quicksort program in Prolog (adapted from Clocksin and Mellish [1994])