(define p1 (cons (cons 1 2) 3))

(define p2 (cons 5 6))

(define p3 (cons 7 p2))

(define p4 (cons p2 8))

; Goals: draw diagrams showing p1, p2, p3, p4
;        write expressions that will pull the 1, 2, 3 out of p1
;                                         the 5, 6, 7 out of p3
;                                         the 5, 6, 8 out of p4
;        write definitions of p5 and p6 for the diagram I draw