1.7 Try to understand how Prolog derives answers to the following questions, using the program of Figure 1.8. Try to draw the corresponding derivation diagrams in the style of Figure 1.9. Will any backtracking occur at particular questions?

(a) ?-parent(pam, bob).

(b) ?-mother( pam, bob).

(c) ?-grandparent(pam, ann).

(d) ?-grandparent(bob, jim).