(define my-list '(1 2 3))
(list? my-list)            ; is it a list?
(null? my-list)            ; is it the empty list?
(equal? my-list '(1 2 3))  ; do these have the same elements?
(number? my-list)          ; is my-list a number?
(number? 3)                ; is 3 a number?
(member 2 my-list)         ; is 2 an element of (1 2 3)?
(member 2 '(1 (2) 3))      ; is 2 an element of (1 (2) 3)?
