Lisp Heap Question

Consider the following diagram showing a Lisp symbol table and heap. Please answer questions which follow.

What is the value of nargle?
What is the value of fred?
Show the diagram after the following operations are performed.
- (setq morris (car morris))
- (setq dilbert (cons (cdr (car fred)) nargle))
- (setq fred (cdr fred))
Show what portions of the heap have now become garbage.